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74LVQ161TTR bảng dữ liệu(PDF) 1 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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July 2004
s
HIGH SPEED:
fMAX = 180 MHz (TYP.) at VCC = 3.3 V
s
COMPATIBLE WITH TTL OUTPUTS
s
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA=25°C
s
LOW NOISE:
VOLP = 0.3V (TYP.) at VCC = 3.3V
s
75
Ω TRANSMISSION LINE DRIVING
CAPABILITY
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 12mA (MIN) at VCC = 3.0 V
s
PCI BUS LEVELS GUARANTEED AT 24 mA
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2V to 3.6V (1.2V Data Retention)
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 161
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The
74LVQ161
is
a
low
voltage
CMOS
SYNCHRONOUS
PRESETTABLE
COUNTER
fabricated
with
sub-micron silicon gate and
double-layer metal wiring C2MOS technology. It is
ideal
for
low
power
and
low
noise
3.3V
applications. 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 (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. All inputs and
outputs are equipped with protection circuits
against static discharge, giving them 2KV ESD
immunity and transient excess voltage.
74LVQ161
SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
Figure 1: Pin Connection And IEC Logic Symbols
Table 1: Order Codes
PACKAGE
T & R
SOP
74LVQ161MTR
TSSOP
74LVQ161TTR
TSSOP
SOP
Rev. 2


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