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74ACT161TTR 数据表(PDF) 1 Page - STMicroelectronics

部件名 74ACT161TTR
功能描述  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
Download  13 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

74ACT161TTR 数据表(HTML) 1 Page - STMicroelectronics

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April 2001
s
HIGH SPEED:
fMAX = 290MHz (TYP.) at VCC = 5V
s
LOW POWER DISSIPATION:
ICC = 8µA(MAX.) at TA=25°C
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 = 24mA (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 74ACT161 is an advanced high-speed CMOS
SYNCRONOUS
PRESETTABLE
COUNTER
fabricated with sub-micron
silicon gate
and
double-layer metal wiring C2MOS tecnology. 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, (CLEAR), (LOAD), (PE) and (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
inputs to be loaded into the flip-flop on the next
rising edge of CLOCK. With LOAD and CLEAR
HIGH, PE and TE permit counting when both are
HIGH. Conversely, a LOW signal on either PE and
TE inhibits counting.
The CARRY OUTPUT is HIGH when TE is HIGH
and counter is in state 15.
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.
74ACT161
SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
74ACT161B
SOP
74ACT161M
74ACT161MTR
TSSOP
74ACT161TTR
TSSOP
DIP
SOP


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