74lvc163bq NXP Semiconductors, 74lvc163bq Datasheet - Page 2

• Manufacturer Part Number: 74lvc163bq
• Description: Presettable Synchronous 4-bit Binary Counter; Synchronous Reset
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
DESCRIPTION
The 74LVC163 is a high-performance, low-power,
low-voltage, Si-gate CMOS device and superior to most
advanced CMOS compatible TTL families.
The 74LVC163 is a synchronous presettable binary
counter which features an internal look-head carry and can
be used for high-speed counting. Synchronous operation
is provided by having all flip-flops clocked simultaneously
on the positive-going edge of the clock (pin CP). The
outputs (pins Q0 to Q3) of the counters may be preset to a
2004 May 05
Wide supply voltage range from 1.2 V to 3.6 V
Complies with JEDEC standard JESD8-B/JESD36
Inputs accept voltages up to 5.5 V
CMOS low power consumption
Direct interface with TTL levels
Synchronous reset
Synchronous counting and loading
Two count enable inputs for n-bit cascading
Positive edge-triggered clock.
ESD protection:
– HBM EIA/JESD22-A114-B exceeds 2000 V
– MM EIA/JESD22-A115-A exceeds 200 V.
Specified from 40 C to +85 C and 40 C to +125 C.
Presettable synchronous 4-bit binary
counter; synchronous reset
2
HIGH-level or LOW-level. A LOW-level at the parallel
enable input (pin PE) disables the counting action and
causes the data at the data inputs (pins D0 to D3) to be
loaded into the counter on the positive-going edge of the
clock (provided that the set-up and hold time requirements
for PE are met). Preset takes place regardless of the levels
at count enable inputs (pins CEP and CET). A LOW-level
at the master reset input (pin MR) sets all four outputs of
the flip-flops (pins Q0 to Q3) to LOW-level after the next
positive-going transition on the clock input (pin CP)
(provided that the set-up and hold time requirements for
PE are met). This action occurs regardless of the levels at
input pins PE, CET and CEP. This synchronous reset
feature enables the designer to modify the maximum count
with only one external NAND gate.
The look-ahead carry simplifies serial cascading of the
counters. Both count enable inputs (pins CEP and CET)
must be HIGH to count. The CET input is fed forward to
enable the terminal count output (pin TC). The TC output
thus enabled will produce a HIGH output pulse of a
duration approximately equal to a HIGH-level output of Q0.
This pulse can be used to enable the next cascaded stage.
The maximum clock frequency for the cascaded counters
is determined by t
(set-up time CEP to CP) according to the
formula:
f
max
=
------------------------------------ -
t
PHL max
PHL
(propagation delay CP to TC) and t
1
+
t
su
.
Product specification
74LVC163
su