74ACT163 datasheet(1/11 Pages) STMICROELECTRONICS

Numer części	74ACT163

Szczegółowy opis	SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

PDF	11 Pages

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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74ACT163

SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

December 1998

s

HIGH SPEED:

fMAX =200 MHz (TYP.) at VCC =5V

s

LOW POWER DISSIPATION:

ICC =4

µA (MAX.) at TA =25 oC

s

COMPATIBLE WITH TTL OUTPUTS

VIH =2V (MIN), VIL = 0.8V (MAX)

s

50

Ω TRANSMISSION LINE DRIVING

CAPABILITY

s

SYMMETRICAL OUTPUT IMPEDANCE:

|IOH|=IOL = 24 mA (MIN)

s

BALANCED PROPAGATION DELAYS:

tPLH

≅ tPHL

s

OPERATING VOLTAGE RANGE:

VCC (OPR) = 4.5V to 5.5V

s

PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 163

s

IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The

ACT163

is

a

high-speed

CMOS

SYNCRONOUS

PRESETTABLE

COUNTER

fabricated with sub-micron silicon gate and

double-layer metal wiring C

2MOS technology. It is

ideal for low power applications mantaining high

speed operation similar to eqivalent Bipolar

Schottky TTL. It is a 4 bit binary counter with

Synchronous Clear.

The circuits have four fundamental modes of

operation, in order of preference: synchronous

reset, parallel load, count-up and hold. Four

control inputs, Master Reset (CLEAR), Parallel

Enable Input (LOAD), Count Enable Input (PE)

and Count Enable Carry Input (TE), determine

the mode of operation as shown in the Truth

Table. A LOW signal on CLEAR overrides

counting and parallel loading and allows all

output to go LOW on the next rising

edge of

CLOCK. A LOW signal on LOAD overrides

counting and allows information on Parallel Data

Qn inputs to be loaded into the flip-flops on the

next rising edge of CLOCK. With LOAD and

CLEAR, PE and TE permit counting when both

are HIGH. Conversely, a LOW signal on either

PE and TE inhibits counting.

The device is designed to interface directly High

Speed CMOS systems with TTL, NMOS and

CMOS output voltage levels.

All inputs

and

outputs are

equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

M

(Micro Package)

B

(Plastic Package)

ORDER CODES :

74ACT163B

74ACT163M

®

1/11

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