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74HC6323AD
Programmable ripple counter with oscillator; 3-state
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
FEATURES 8-pin space saving package Programmable 3-stage ripple
counter Suitable for over-tone crystal
application up to 50 MHz
(VCC =5V± 10%) 3-state output buffer Two internal capacitors Recommended operating range for
use with third overtone crystals
3to6V Oscillator stop function (MR) Output capability:
bus driver → (15 LSTTL) ICC category: MSI.
APPLICATIONS Control counters Timers Frequency dividers Time-delay circuits CIO (Compact Integrated
Oscillator) Third-overtone crystal operation.
GENERAL DESCRIPTIONThe HC/HCT6323A are high-speed
Si-gate CMOS devices.
They are specified in compliance with
JEDEC standard no. 7A.
The HC/HCT6323A are oscillators
designed for quartz crystal combined
with a programmable 3-state counter,
a 3-state output buffer and an
overriding asynchronous master
reset (MR). With the two select inputs
S1 and S2 the counter can be
switched in the divide-by-1, 2, 4 or 8
mode. If left floating the clock is
divided by 8. The oscillator is
designed to operate either in the
fundamental or third overtone mode
capacitors minimize external
component count for third overtone
crystal applications.
The oscillator may be replaced by an
external clock signal at input X1. In
this event the other oscillator pin (X2)
must be floating. The counter
advances on the negative-going
transition of X1. A LOW level on MR
resets the counter, stops the oscillator
and sets the output buffer in the
3-state condition. MR can be left
floating since an internal pull-up
resistor will make the MR inactive. In
the HCT version, the MR input and
the two mode select pins S1 and S2
are TTL compatible, but the X1 input
has CMOS input switching levels and
may be driven by a TTL output using
a pull-up resistor connected to VCC.
QUICK REFERENCE DATAGND = 0 V; Tamb = 25 °C; tr = tf = 6 ns.
Notes CPD is used to determine the dynamic power dissipation (PD in μW):
PD = (CPD x VCC2 x fi) + (CL + VCC2 x fo) + (Ipull-up x VCC)
where:
fi = input frequency in MHz; fo = output frequency in MHz.
VCC = supply voltage in V; CL = output load capacitance in pF.
Ipull-up = pull-up currents in μA. For HC and HCT an external clock is applied to X1 with:
tr = tf ≤ 6 ns, Vi is GND to VCC, MR = HIGH
Ipull-up is the summation of −II (μA) of S1 and S2 inputs at the LOW state.
ORDERING INFORMATION
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
PINNING
FUNCTION TABLE
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: non-standard; bus driver (except for X2)
ICC category: MSI.
Voltages are referenced to GND (ground = 0 V).
DC CHARACTERISTICS FOR 74HC
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
AC CHARACTERISTICS FOR 74HCGND = 0 V; tr = tf = 6 ns; CL = 50 pF.
Note to the 74HC AC Characteristics tPZH only applicable in the divide-by-1 mode and X1 must be HIGH.
Philips Semiconductors Product specification
Programmable ripple counter with
oscillator; 3-state 74HC/HCT6323A
DC CHARACTERISTICS FOR 74HCTFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver (except for X2).
ICC category: MSI.
Voltages are referenced to GND (ground = 0 V).
