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7493

Integrated Circuit TTL − 4−Bit Binary Counter

NTE Electronics 

NTE7493A

Integrated Circuit

TTL − 4−Bit Binary Counter

Description:

The NTE7493A is a monolithic 4−bit binary counter in a 14−Lead DIP type package that contains four

master−slave flip−flops and additional gating to provide a divide−by−two counter and a three−stage binary

counter for which the count cycle length is divide−by−eight. The counter also contains a gated zero reset.

To use the maximum count length of this device, the CKB input is connected to the QA output. The input

count pulses are applied to CKA input and the outputs are as described in the function tables.

Absolute Maximum Ratings: (Note 1)

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V

Interemitter Voltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V

Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130mW

Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C

Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65C to +150C

Note 1. Unless otherwise specified, all voltages are referenced to GND.

Note 2. This is the voltage between two emitters of a multiple−emitter transistor. For this device, this

rating applies between the two R0 inputs.

Recommended Operating Conditions:

Parameter

Supply Voltage

High−Level Output Current

Low−Level Output Current

Count Frequency

A Input

B Input

Pulse Width

A Input

B Input

Reset Inputs

Reset Inactive Setup Time

Operating Temperature Range

Symbol

VCC

IOH

IOL

fcount

tw

tsu

TA

Min Typ Max Unit

4.75 5.0 5.25 V

− − −800 A

− − 16 mA

0 − 32 MHz

0 − 16 MHz

15 −

−

ns

30 − − ns

15 − − ns

25 − − ns

0 − +70 C

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