Features

• Select One of Eight Data Outputs

- Active Low for CD74HC137 and CD74HCT137

- Active High for ’HC237 and CD74HCT237

• l/O Port or Memory Selector

• Two Enable Inputs to Simplify Cascading

• Typical Propagation Delay of 13ns at VCC = 5V,

15pF, TA = 25oC (CD74HC237)

• Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL

Logic ICs

• HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30%, of VCC

at VCC = 5V

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, Il ≤ 1μA at VOL, VOH

Description

The CD74HC137, CD74HCT137, ’HC237, and

CD74HCT237 are high speed silicon gate CMOS decoders

well suited to memory address decoding or data routing

applications. Both circuits feature low power consumption

usually associated with CMOS circuitry, yet have speeds

comparable to low power Schottky TTL logic.

Both circuits have three binary select inputs (A0, A1 and A2)

that can be latched by an active High Latch Enable (LE)

signal to isolate the outputs from select-input changes. A

“Low” LE makes the output transparent to the input and the

circuit functions as a one-of-eight decoder. Two Output

Enable inputs (OE1 and OE0) are provided to simplify

cascading and to facilitate demultiplexing. The

demultiplexing function is accomplished by using the A0, A1,

A2 inputs to select the desired output and using one of the

other Output Enable inputs as the data input while holding

the other Output Enable input in its active state. In the

CD74HC137 and CD74HCT137 the selected output is a

“Low”; in the ’HC237 and CD74HCT237 the selected output is

a “High”.