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INTEGRATED CIRCUITS
74F244/74F244B Octal buffers (3-State)
Product specification IC15 Data Handbook 1994 Dec 05
Philips Semiconductors
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
FEATURES
* Octal bus interface * 3-State output buffer sink 64mA * 15mA source current * Guaranteed output skew less than 2.0ns (74F244B) * Reduced ground bounce (74F244B) * Reduced ICC (74F244B) * Reduced loading (74F244B IIL = 40A) * Split lead frame offers increased noise immunity (74F244B) * Industrial temperature range available (-40C to +85C) for
74F244
DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of buffer memory address registers. The outputs are all capable of sinking 64mA and sourcing up to 15mA, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs. The 74F244B is functionally equivalent to the 74F244. It has been designed to reduce effects of ground noise. Other advantages are noted in the features. TYPICAL PROPAGATION DELAY 4.0ns 4.0ns
TYPE 74F244 74F244B
TYPICAL SUPPLY CURRENT (TOTAL) 53mA 33mA
* 74F244 available in SSOP Type II package
ORDERING INFORMATION
ORDER CODE COMMERCIAL RANGE DESCRIPTION VCC = 5V 10%, Tamb = 0C to +70C 20-pin plastic DIP 20-pin plastic SOL 20-pin plastic SSOP II N74F244N, N74F244BN N74F244D, N74F244BD N74F244DB
INDUSTRIAL RANGE VCC = 5V 10%, Tamb = -40C to +85C I74F244N I74F244D
PKG DWG #
SOT146-1 SOT163-1 SOT339-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS Ian, Ibn Data inputs (74F244) Data inputs (74F244B) OEa, OEb Output enable inputs (active low) (74F244) Output enable inputs (active low) (74F244B) Yan, Ybn Data outputs NOTE: One (1.0) FAST unit load is defined as: 20A in the high state and 0.6mA in the low state. DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/2.67 1.0/0.067 1.0/1.67 1.0/0.067 750/106.7 LOAD VALUE HIGH/LOW 20A/1.6mA 20A/40A 20A/1.0mA 20A/40A 15mA/64mA
PIN CONFIGURATION
OEa 1 Ia0 2 Yb0 3 Ia1 4 Yb1 5 Ia2 6 Yb2 7 Ia3 8 Yb3 9 GND 10 20 VCC 19 OEb 18 Ya0 17 Ib0 16 Ya1 15 Ib1 14 Ya2 13 Ib2 12 Ya3 11 Ib3
LOGIC SYMBOL
2 4 6 8 17 15 13 11
Ia0 1 19 OEa OEb
Ia1
Ia2
Ia3 Ib0
Ib1
Ib2
Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
18 VCC = Pin 20 GND = Pin 10
16
14
12
3
5
7
9
SF00227
SF00228
1994 Dec 5
2
853-0357 14381
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
IEC/IEEE SYMBOL
1 19 EN1 EN2
FUNCTION TABLE
INPUTS OEa L Ia L H X OEb L L H Ib L H X OUTPUTS Ya L H Z Yb L H Z
2 4 6 8 17 15 13 11
2D
1
18 16 14 12
L H
2
3 5 7 9
NOTES: H = High voltage level L = Low voltage level X = Don't care Z = High impedance "off" state
SF00229
LOGIC DIAGRAM
Ia0 2 18 Ya0 Ib0 17 3 Yb0
Ia1
4
16
Ya1
Ib1
15
5
Yb1
Ia2
6
14
Ya2
Ib2
13
7
Yb2
Ia3
8
12
Ya3
Ib3
11
9
Yb3
OEa
1
OEb
19
VCC = Pin 20 GND = Pin 10
SF00230
1994 Dec 5
3
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.) SYMBOL VCC VIN IIN VOUT IOUT Supply voltage Input voltage Input current Voltage applied to output in high output state Current applied to output in low output state Commercial range Tamb Tstg Operating f O ti free air t i temperature range t Storage temperature range Industrial range (74F244 only) PARAMETER RATING -0.5 to +7.0 -0.5 to +7.0 -30 to +5 -0.5 to VCC 128 0 to +70 -40 to +85 -65 to +150 UNIT V V mA V mA
C C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIN VIL IIK IOH iol Tamb Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Commercial range Operating f O ti free air t i temperature range t Industrial range (74F244 only) 0 -40 PARAMETER MIN 4.5 2.0 0.8 -18 -15 64 +70 +85 NOM 5.0 MAX 5.5 UNIT V V V mA mA mA
C C
1994 Dec 5
4
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER VCC = MIN, VOH High-level output voltage VIL = MAX, VIH = MIN IOH = -15mA TEST CONDITIONS1 IOH = -3mA 10%VCC 5%VCC 10%VCC 5%VCC VOL Low-level output voltage VCC = MIN, VIL = MAX, VIH = MIN, VIK II IIH IIL Input clamp voltage Input current at maximum input voltage High-level input current 74F244 OEa, OEb Low-level input current 74F244 Ian, Ibn 74F244B all inputs IOZH IOZL IOS Off-state output current, high-level voltage applied Off-state output current, low-level voltage applied Short-circuit output current3 ICCH 74F244 ICC Supply current (total) ICCL ICCZ ICCH 74F244B ICCL ICCZ VCC = MAX VCC = MAX VCC = MAX, VO = 2.7V VCC = MAX, VO = 0.5V VCC = MAX -100 40 60 60 20 50 29 VCC = MAX, VI = 0.5V VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V IOL = MAX 10%VCC 5%VCC 0.42 -0.73 LIMITS MIN 2.5 2.7 2.0 2.0 0.55 0.55 -1.2 100 20 -1.0 -1.6 -40 50 -50 -225 60 90 90 30 70 40 3.4 TYP2 MAX UNIT V V V V V V V A A mA mA A A A mA mA mA mA mA mA
mA NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. 2. All typical values are at VCC = 5V, Tamb = 25C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last.
1994 Dec 5
5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
AC ELECTRICAL CHARACTERISTICS FOR 74F244
A PORT LIMITS Tamb = +25C SYMBOL PARAMETER TEST CONDITION VCC = +5.0V CL = 50pF, RL = 500 MIN tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation delay Ian, Ibn to Yn Output enable time to high or low Output disable time from high or low Waveform 1 Waveform 2 Waveform 4 Waveform 2 Waveform 4 2.5 2.5 2.0 2.0 1.5 1.5 TYP 4.0 4.0 4.3 5.0 2.5 2.5 MAX 5.2 5.2 5.7 7.0 5.5 5.5 Tamb = 0C to +70C VCC = +5.0V 10% CL = 50pF, RL = 500 MIN 2.0 2.0 2.0 2.0 1.0 1.0 MAX 6.2 6.5 6.7 8.0 6.0 5.5 Tamb = -40C to +85C VCC = +5.0V 10% CL = 50pF, RL = 500 MIN 1.5 2.0 2.0 2.0 1.0 1.0 MAX 7.0 7.0 8.0 8.5 6.0 5.5 ns ns ns UNIT
AC ELECTRICAL CHARACTERISTICS FOR 74F244B
LIMITS Tamb = +25C SYMBOL PARAMETER TEST CONDITION VCC = +5.0V CL = 50pF, RL = 500 MIN tPLH tPHL tPZH tPZL tPHZ tPLZ tsk(0) Propagation delay Ian, Ibn to Yn Output enable time to high or low level Output disable time from high or low level Output skew1, 2 Waveform 1 Waveform 2 Waveform 4 Waveform 2 Waveform 4 Waveform 3 2.5 2.5 2.0 3.0 1.5 1.5 TYP 4.5 4.5 4.0 5.5 2.5 2.5 MAX 5.7 6.0 6.0 7.5 5.5 5.5 1.5 VCC = +5.0V 10% CL = 50pF, RL = 500 MIN 2.0 2.5 2.0 3.0 1.0 1.0 MAX 6.2 6.5 6.5 8.0 6.0 5.5 2.0 ns ns ns ns Tamb = 0C to +70C UNIT
NOTES: 1. |tPN actual - tPM actual| for any output compared to any other output where N and M are either LH or HL. 2. Skew times are valid only under same test conditions (temperature, VCC, loading, etc.,).
1994 Dec 5
6
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
VM
VM tPHL
Yn, Yn
VM tsk(0)
tPLH
Yn
VM
VM
Yn, Yn
VM
SF00231
SF00232
Waveform 1. Propagation Delay for data to outputs
Waveform 3. Output skew
OEn
VM
VM
OEn
VM tPZL
VM tPLZ 3.5V
tPZH
tPHZ VOH-0.3V Yn 0V
Yn
VM
VM VOL+0.3V
SF00233
SF00234
Waveform 2. 3-State output enable time to high level and output disable time from high level
Waveform 4. 3-State output enable time to low level and output disable time from low level
TEST CIRCUIT AND WAVEFORMS
SWITCH POSITION TEST SWITCH tPLZ, tPZL closed All other open
VIN PULSE GENERATOR RT D.U.T. tTLH (tr ) CL RL POSITIVE PULSE 10% 90% VM tw tTHL (tf ) AMP (V) 90% VM 10% 0V VCC 7.0V 90% NEGATIVE PULSE VM 10% VOUT RL tTHL (tf ) tw VM 10% tTLH (tr ) 0V 90% AMP (V)
Test circuit for 3-State outputs DEFINITIONS: RL = Load resistor; see AC electrical characteristics for value. CL = Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value RT = Termination resistance should be equal to ZOUT of pulse generators.
Input pulse definition INPUT PULSE REQUIREMENTS family amplitude 74F 3.0V VM 1.5V rep. rate 1MHz tw tTLH tTHL 2.5ns
SF000235
500ns 2.5ns
1994 Dec 5
7
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
1994 Dec 05
8
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
1994 Dec 05
9
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
1994 Dec 05
10
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
NOTES
1994 Dec 05
11
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes at any time without notice, in order to improve design and supply the best possible product.
9397-750-05103
Preliminary Specification
Preproduction Product
Product Specification
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. LIFE SUPPORT APPLICATIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 Philips Semiconductors and Philips Electronics North America Corporation register eligible circuits under the Semiconductor Chip Protection Act. (c) Copyright Philips Electronics North America Corporation 1996 All rights reserved. Printed in U.S.A. (print code) Document order number: Date of release: October 28, 1991 9397-750-05103

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