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74ACT161M 数据表(PDF) 1 Page - STMicroelectronics

部件名 74ACT161M
功能描述  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
Download  11 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

74ACT161M 数据表(HTML) 1 Page - STMicroelectronics

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74ACT161
SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
December 1998
s
HIGH SPEED:
fMAX =125 MHz (TYP.) at VCC =5V
s
LOW POWER DISSIPATION:
ICC =8
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 161
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The
ACT161
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
Asynchronous Clear.
The circuit 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 sets all outputs
on LOW state. 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 :
74ACT161B
74ACT161M
®
1/11


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