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QUAD BUS TRANSCEIVER
The SN54 / 74LS242 and SN54 / 74LS243 are Quad Bus Transmitters / Receivers designed for 4-line asynchronous 2-way data communications between data buses.
SN54/74LS242 SN54/74LS243
* Hysteresis at Inputs to Improve Noise Immunity * 2-Way Asynchronous Data Bus Communication * Input Clamp Diodes Limit High-Speed Termination Effects
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) SN54 / 74LS242
VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8
QUAD BUS TRANSCEIVER
LOW POWER SCHOTTKY
J SUFFIX CERAMIC CASE 632-08
14 1
1 GBA
2 NC
3 1A
4 2A
5 3A
6 4A
7 GND
14 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1
N SUFFIX PLASTIC CASE 646-06
SN54 / 74LS243
VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8
14 1
D SUFFIX SOIC CASE 751A-02
ORDERING INFORMATION
1 GBA 2 NC 3 1A 4 2A 5 3A 6 4A 7 GND SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC
TRUTH TABLES SN54 / 74LS242
INPUTS OUTPUT GAB L L H D L H X H L (Z) GAB L H H D X L H (Z) H L INPUTS OUTPUT GAB L L H D L H X L H (Z) INPUTS OUTPUT GAB L H H D X L H (Z) H L
SN54/74LS243
INPUTS OUTPUT
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = HIGH Impedance
FAST AND LS TTL DATA 5-1
SN54/74LS242 * SN54/74LS243
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 S bl VIH VIL VT+-VT- VIK VOH Parameter P 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 D, E1, E2 IIH I Input HIGH C Current E1, E2 D Input IIL IOS Input LOW Current Output Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH ICC Total, Output LOW LS242 Total at HIGH Z LS243 54
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 Ui V
Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g 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
0.7 V 0.8 0.2 0.4 - 0.65 2.4 2.0 0.25 0.35 0.4 0.5 40 - 200 20 0.1 0.1 - 0.2 - 40 - 225 38 50 50 mA A 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 = 0.4 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
SN54/74LS242 * SN54/74LS243
AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V)
Limits LS242 Symbol S bl tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter P Propagation Delay, Data to Output Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Min Typ 9.0 12 15 20 15 10 Max 14 18 23 30 25 18 Min LS243 Typ 12 12 15 20 15 10 Max 18 18 23 30 25 18 Unit Ui ns ns ns ns ns CL = 5.0 p , pF, RL = 667 CL = 45 pF, RL = 667 Test C di i T Conditions
AC WAVEFORMS
VIN
1.3 V tPLH
1.3 V tPHL 1.3 V SW1
VCC RL
VOUT
1.3 V
Figure 1
TO OUTPUT UNDER TEST VIN 1.3 V tPHL VOUT 1.3 V 1.3 V tPLH 1.3 V
5 k CL* SW2
Figure 2
VE VE VOUT
1.3 V tPZL 1.3 V
1.3 V tPLZ 1.3 V VOL SYMBOL tPZH tPZL tPLZ tPHZ
SWITCH POSITIONS
SW1 Open Closed Closed Closed SW2 Closed Open Closed Closed
0.5 V
Figure 3
VE 1.3 V VE VOUT tPZH 1.3 V 1.3 V tPHZ VOH 1.3 V 0.5 V
Figure 5
Figure 4
FAST AND LS TTL DATA 5-3

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