The MC54/74HC240A is identical in pinout to the LS240. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.
This octal noninverting buffer/line driver/line receiver is designed to be used with 3–state memory address drivers, clock drivers, and other sub–oriented systems. The device has inverting outputs and two active–low output enables.
The HC240A is similar in function to the HC241A and HC244A.
Features:
• Output Drive Capability: 15 LSTTL Loads• Outputs Directly Interface to CMOS, NMOS, and TTL• Operating Voltage Range: 2 to 6 V• Low Input Current: 1 μA• High Noise Immunity Characteristic of CMOS Devices• In Compliance with the Requirements Defined by JEDEC Standard No. 7A• Chip Complexity: 120 FETs or 30 Equivalent Gates
(Absolute) Maximum Ratings:
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
– 0.5 to +7.0
V
Vin
DC Input Voltage (Referenced to GND)
– 0.5 to VCC +0.5
V
Vout
DC Output Voltage (Referenced to GND)
– 0.5 to VCC + 0.5
V
Iin
DC Input Current, per Pin
± 20
mA
Iout
DC Output Current, per Pin
± 35
mA
ICC
DC Supply Current, VCC and GND Pins
± 75
mA
PD
Power Dissipation in Still Air, Plastic or Ceramic DIP† SOIC Package† TSSop or Tssop package†
750 500 450
mW
Tstg
Storage Temperature
– 65 to + 150
℃
TL
Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP, SOIC or TSSOP Package) (Ceramic DIP)
260 300
℃
*Maximum Ratings are those values beyond which damage to the device may occur.Functional operation should be restricted to the Recommended Operating Conditions. †Derating — Plastic DIP: – 10 mW/℃ from 65 ° to 125℃ Ceramic DIP: – 10 mW/℃ from 100 ° to 125℃ SOIC Package: – 7 mW/℃ from 65 ° to 125℃ TSSOP Package: – 6.1 mW/℃ from 65° to 125℃
For high frequency or heavy load considerations, see Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D).
This device contains protection circuitry to guard against damage due to high static voltages or electric fields.However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high–impedance circuit. For proper operation, Vin and Vout should be constrained to the range GND ≤ (Vin or Vout) ≤ VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open.
