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Semiconductor MSM5547
Semiconductor Digital Clock
MSM5547
GENERAL DESCRIPTION
MSM5547 is a clock IC featuring a wide power supply range with 4.194304 MHz original oscillation. MSM5547 is a 12 hour cycle AM/PM clock for a static fluorescent character display tube. Time correction is in hour, minute and 30 minute adjustments. Hour and minute are corrected by a 2 Hz fast-forward function. MSM 5547 also has a contrast adjustment function for the fluorescent character display tube, which can set four levels of contrast, including 100% duty.
FEATURES
* 12 hour clock (AM/PM) * Applied for static fluorescent character display tube * Wide power supply range: 4 to 16V * 4.194304 MHz original oscillation * 4 levels of contrast can be selected * Package: 44-pin plastic QFP (QFP44-P-910-L2) (Product name: MSM 5547GS-L2) 42-pin plastic DIP (DIP42-P-600) (Product name: MSM 5547RS)
BLOCK DIAGRAM
OSC OUT OSC IN TEST 1 TEST 2 TEST 3 VSS
Time adjustment
CMOS
Oscillation
Frequency dividers
1Hz
64Hz 1Hz a1 b1
VDD
Test adjustment
1 / 60 Decoder segment
VDD A/C SE ZA MS HS VSS DIM CONT 1 DIM CONT 2 DIM TEST 4 VSS VDD Contrast adjustment
(1 / 60)
Hour counter (1 / 12) AM PM
Decoder segment
Driver [PCH open drain]
Minute counter
g3 b4 c4 AM PM
VDD
1
MSM5547
Semiconductor
PIN CONFIGURATION (TOP VIEW)
41 TEST 1
37 TEST 2
40 TEST 4
38 TEST 3
g3 1 e3 2 d3 3 c3 4 g2 5 e2 6 c2 7 g1 8 e1 9 d1 10 c1 11
44 c4
34 AM
33 b4 32 f3 31 a3 30 b3 29 1 Hz 28 f2 27 a2,d2 26 b2 25 f1 24 a1 23 b1
36 MS OSC IN 20
43 PM
39 NC
64Hz 12
DIM 13
SE 14
VDD 15
DIM CONT1 16
NC 17
DIM CONT2 18
VSS 19
OSC OUT 21
35 HS
42 ZA
44-pin plastic QFP
(Model name indicated on actual product is M 5547)
2
A/C 22
Semiconductor
MSM5547
TEST 4 1 TEST 1 2 ZA 3 PM 4 c4 5 g3 6 e3 7 d3 8 c3 9 g2 10 e2 11 c2 12 g1 13 e1 14 d1 15 c1 16 64 Hz 17 DIM 18 SE 19 VDD 20 DIM CONT1 21
42 TEST 3 41 TEST 2 40 MS 39 HS 38 AM 37 b4 36 f3 35 a3 34 b3 33 1Hz 32 f2 31 a2, d2 30 b2 29 f1 28 a1 27 b1 26 A/C 25 OSC OUT 24 OSC IN 23 VSS 22 DIM CONT2
42-pin plastic DIP
3
MSM5547
Semiconductor
ABSOLUTE MAXIMUM RATING
Parameter Power supply voltage Input voltage input current P channel open drain Output pin withstanding voltage P channel open drain output current Power dissipation Storage temperature range Symbol VDD - VSS VI II VO IO PD TSTG -- Ta = 25C Condition Rating -0.3 to 18 VSS - 0.3 VI VDD + 0.3 10 VDD - 26 -10 200 -55 to +150 Unit V V mA V mA mW C
RCOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage operating temperature Crystal frequency Symbol VDD - VSS TOP f(x'tal) Condition -- -- -- Range 4 to 16 -30 to +85 4.194304 Unit V C MHz
ELECTRICAL CHARACTERISTICS
DC Characteristics
Parameter Input voltage "1" level "0" level TEST 1 TEST 2 ZA,MS,HS,DIM DIM CONT1 "L" input current TEST 3,4 "H" input current
"L" input current A/C "L" input current SE,DIM,CONT2
(VDD = 6.0 V, VSS = 0 V, Ta = -30 to +85C) Symbol VIH VIL IIH1 Condition -- -- VI = VDD Min 4.3 -- 30 Typ -- -- -- Max -- 1.0 150 mA Unit V
IIL1 IIL2 IIL3 VOH VOL IOH1 IOL1 IOH2 IOL2 IOH3 IOL3 IDD
VI = VSS
-120 -3 -30
-- -- -- -- -- -- -- -- -- -- -- --
-600 -12 -150 -- 0.1 -- -1.0 -- -1.0 -- -- 2
mA
Output voltage
"1" level (All output) "0" level (64 Hz output)
IOH = 0A IOL = 0A VOH = 4.0 V VOL = 0 V VOH = 4.0 V VOL = 0 V VOH = 5.5 V VOL = 0.5 V CIN = 39pF 5% COUT = 33pF 5% CI = 70W 5% f(x'tal) = 4.194304 MHz No load
5.9 -- -2000 -- -1000 -- -100 100 --
V
Output current Output current Output current
1 Hz, a2, d2, AM, PM output pins
Other segment output pins except above
mA mA mA mA
64 Hz output pin
Dynamic operating current
4
Semiconductor
MSM5547
FUNCTIONAL DESCRIPTION
Time Base *4.194304 MHz crystal oscillator *Internal crystal oscillation circuit (AMP, feedback resistance) 7 segment display format
Display device *4 digit static fluorescent character display tube (with AM, PM, colon) *Colon display blinks at 1 Hz with a 50% duty ratio
Contrast selecting function
Selector pin name DIM "0" (or open) "1" "1" "1" DIM CONT1 * "0" (or open) "0" (or open) "1" DIM CONT2 * "1" (or open) "0" "1" (or open) Operation mode 100% duty display 25% (1/4) duty display at 4096 Hz 12.5% (1/8) duty display at 4096 Hz 6.25% (1/16) duty display at 4096 Hz
"1": high level, "0": low level, *: don't care Display Mode * For 12 hour display, hour-minute 4-digit display Hour display: 1 to 12 Minute display: 0 to 59 * 0 at highest digit is not displayed. (Highest digit zero suppress function)
5
MSM5547 Time Correction Hour-minute fast-forward function
Semiconductor
* Hour or minute can be fast-forwarded individually. The HS (hours set) pin fast-forwards the hour digit and the MS (minutes set) pin forwards the minute digit at 2 Hz. * In open status, the HS and MS pins are held to "0" level by a pull-down resistor, and are in inactive status. These pins become active by being set to "1" level externally. * It takes 0.242 ~ 0.5 sec from when the HS and MS pins become active to when +1 is counted. After a +1 count, time is counted in 0.5 sec (2 Hz) units. * Hour digit and minute digits can be fast-forwarded in parallel. * To fast-forward hour digit, the lower counter continues normal operation but does not carry from minute to hour digit. * For fast-forwarding minute digit, the counter does not carry to the hour digit. The second digit continues normal operation but does not carry to the minute digit. Time Setting Function ( 30 minutes reset to zero) * In open status, the ZA (zero adjust) pin is held to "0" level by a pull-down resistor and is in inactive status. This pin becomes active and enables time setting by being set to "1" level externally. * Time is set at Min. 0.00 sec to Max. 0.0312 sec after the ZA pin becomes "1" level. * For time setting, minute and second digits are reset to 00' 00". The colon output starts with "1". If the minute digit is less than 30, minute and second digits are reset to 00'00" . The counters for seconds are reset up to 16 Hz. (Example of Setting) (X-1) hour 30 minutes 00 seconds X hour 00 minutes 00 seconds X hour 29 minutes 59 seconds ~ ~ AE X hour 00 minutes 00 seconds
X hour 30 minutes 00 seconds X hour 59 minutes 59 seconds (X+1) hour 29 minutes 59 seconds ~ ~ AE X+1 hours 00 minutes 00 seconds
6
Semiconductor
MSM5547
SE (set enable) Pin In open status, the SE pin is held to "1" level by a pull-up resistor, enabling input from MS, HS and ZA pins. These inputs become invalid by setting this pin to "0" level externally.
A/C (all clear) Pin * In open status, the A/C pin is held to "1" level by a pull-up resistor, and is in inactive status. The time counter is set at 1 hour 00 minutes 00 seconds AM by setting this pin to "0" level externally. The counter for seconds is rest up to 16 Hz. * If a capacitor is connected between this pin and the Vss pin, 1 hour 00 minutes AM is displayed when power is turned on. Connect a capacitor of 4700 pF or more.
TEST Pin * In open status, TEST 1 and 2 pins are held to "0" level by a pull-down resistor. * In open status, TEST 3 and 4 pins are held to "1" level by a pull-up resistor. TEST Select Function 1
Selector pin name TEST1 "1" f (Pulse) "0" (or open) TEST2 f (Pulse) "1" (or open) f (Pulse) TEST3 "1" (or open) "0" Operation mode Inputs pulse to 16.384 kHz system of the circuit. Inputs pulse to 64 Hz system of the circuit. Inputs pulse to minute counter and hour counter, and advances 1 count with 1 pulse. (Does not carry hour and minute counters.)
TEST Select Function 2
Selector pin name TEST4 "0" DIM f (Pulse) "1" DIM CONT1 DIM CONT2 * * Operation mode Contrast (DC 100%) display Sets all segment outputs to high impedance
* Indicates that input level can be "0" and "1".
7
MSM5547 64 Hz Pin
Semiconductor
This is the output pin for oscillation frequency adjustment, which constantly outputs 64 Hz. Chattering Removal A chattering removal circuit is included on three input pins: MS, HS and ZA. Less than 31.25 msec chattering is neglected.
Input wave form 31.25 msec or less 31.25 msec or less
Treatment of NC Pin Since the NC pin of 17 pin and 39 pin in QFP products are connected to the substrate, set the pins to VDD voltage or to open status.
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