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| SN54/74LS623 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUT The SN54 / 74LS623 series is an octal bus transceiver designed for asynchronous two-way communication between data buses. Control function implementation allows maximum timing flexibility. Enable inputs may be used to disable the device so that buses are effectively isolated. Depending on the Logic Levels at the enable inputs, Data transmission is allowed from the A bus to the B bus or from the B bus to the A bus. The dual-enable configuration gives the LS623 the capability to store data by simultaneous enabling of GBA and GAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs are enabled all other data sources to the two sets of bus lines (16 in all) will remain at their last states. OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUT LOW POWER SCHOTTKY 20 J SUFFIX CERAMIC CASE 732-03 1 CONNECTION DIAGRAM (TOP VIEW) ENABLE VCC GBA B1 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 20 N SUFFIX PLASTIC CASE 738-03 1 20 DW SUFFIX SOIC CASE 751D-03 1 1 2 ENABLE A1 GAB 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND BLOCK DIAGRAM 1/4 LS623 GBA GAB ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC A1 B1 FUNCTION TABLE A2 B2 ENABLE INPUTS GBA L H TO OTHER SIX TRANSCEIVERS H L GAB L H L H OPERATION LS623 B data to A bus A data to B bus Isolation B data to A bus, A data to B bus H = HIGH Level, L = LOW Level, X = Irrelevant FAST AND LS TTL DATA 5-1 SN54/74LS623 GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current -- High Parameter 54 74 54 74 54, 74 54 74 IOL Output Current -- Low 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 3.0 -12 -15 12 24 Unit V C mA mA mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VT+-VT- VIK VOH Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Hysteresis Input Clamp Diode Voltage 54, 74 Output HIGH Voltage 54, 74 54, 74 VOL IOZH IOZL Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW A, or B, GBA or GAB IIH Input HIGH Current GAB or GAB A or B IIL IOS Input LOW Current Short Circuit Current (Note 1) Power Supply Current Total Output HIGH ICC Total Output LOW Total at HIGH Z Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. Min 2.0 Typ Max Unit V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = 3.0 mA VCC = MIN, IOH = MAX IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table 0.5 V 0.6 0.2 0.4 - 0.65 2.4 2.0 0.25 0.35 0.4 0.5 20 - 400 20 0.1 0.1 - 0.4 - 40 - 225 70 90 95 mA 3.4 - 1.5 V V V V V V A A A mA mA mA mA VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 4.0 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 5.5 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX FAST AND LS TTL DATA 5-2 SN54/74LS623 AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Symbol tPLH tPHL tPLH tPHL tPZL tPZH tPZL tPZH tPLZ tPHZ tPLZ tPHZ Parameter Propagation Delay A to B Propagation Delay B to A Output Enable Time GBA to A Output Enable Time GAB to B Output Disable Time GBA to A Output Disable Time GAB to B Min Typ 8.0 11 8.0 11 31 26 31 26 15 15 15 15 Max 15 15 15 15 40 40 40 40 25 25 25 25 Unit ns ns ns ns ns CL = 5.0 pF ns CL = 45 pF, RL = 667 Test Conditions FAST AND LS TTL DATA 5-3 |
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