74ACT163MTR Datasheet, PDF (1/13 Pages) STMicroelectronics – SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

74ACT163
SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
s HIGH SPEED:
f_MAX = 250MHz (TYP.) at V_CC = 5V
s LOW POWER DISSIPATION:
I_CC = 8µA(MAX.) at T_A=25°C
s COMPATIBLE WITH TTL OUTPUTS
V_IH = 2V (MIN.), V_IL = 0.8V (MAX.)
s 50Ω TRANSMISSION LINE DRIVING
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|I_OH| = I_OL = 24mA (MIN)
s BALANCED PROPAGATION DELAYS:
t_PLH ≅ t_PHL
s OPERATING VOLTAGE RANGE:
V_CC (OPR) = 4.5V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 163
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74ACT163 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 Synchronous 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
PIN CONNECTION AND IEC LOGIC SYMBOLS
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
DIP
SOP
TSSOP
TUBE
74ACT163B
74ACT163M
T&R
74ACT163MTR
74ACT163TTR
parallel loading and sets all outputs on LOW state
on the next rising edge of CLOCK . 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 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.
April 2001
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