74HC7731 Datasheet, PDF (2/8 Pages) NXP Semiconductors – Quad 64-bit static shift register

Philips Semiconductors
Quad 64-bit static shift register
Product specification
74HC/HCT7731
FEATURES
• Frequency range DC to 100 MHz.
• Separate serial data inputs
• Cascadable
• Functionally compatible with
HEF 4731
• Includes recycling mode
• Direct shift out
• Output capability: Standard
• I_CC category: LSI.
APPLICATIONS
• Data storage
• Delay line.
GENERAL DESCRIPTION
The HC/HCT7731 are high-speed
Si-gate CMOS devices. They are
specified in compliance with JEDEC
standard no. 7A.
The HC/HCT7731 are quad 64-bit
static shift registers with a recycling
mode. Each register has separate
data inputs D_a to D_d, clock inputs CP_a
to CP_d and data outputs Q_a to Q_d.
Data shifts one place towards the
output, each LOW to HIGH transition
of the clock pulse. Each recycling
mode input controls two registers
REC_ab for registers A and B and
REC_cd for registers C and D. When
the REC input is HIGH, the device is
in the recycling mode and data at the
output is shifted back into the input of
the register, so after 64 clock pulses
the contents of a register is again in
its original position. This enables the
user to tap off data from any position.
When the REC input is LOW external
data can be shifted in.
QUICK REFERENCE DATA
GND = 0 V; T_amb = 25 °C; t_r = t_f = 6 ns.
SYMBOL
PARAMETER
TYP.
CONDITIONS
UNIT
HC HCT
t_PHL/t_PLH
f_max
C_I
C_PD
propagation delay
CP_a-d to Q_a-d
maximum clock
frequency
input capacitance
power dissipation
capacitance per register
C_L = 15 pF;
V_CC = 5 V
notes 1, 2
and 3
15 20 ns
100 100 MHz
3.5 3.5 pF
58 61 pF
Notes
1. C_PD is used to determine the dynamic power dissipation (P_D in µW):
P_D = (C_PD x V_CC2 x f_i) + (C_L + V_CC2 x f_o) + (I_pull-up x V_CC)
where:
f_i = input frequency in MHz.
f_o = output frequency in MHz.
V_CC = supply voltage in V.
C_L = output load capacitance in pF.
I_pull-up = pull-up currents in µA.
2. For HC the condition is V_I = GND to V_CC
For HCT the condition is V_I = GND to V_CC − 1.5 V.
3. See also power dissipation information.
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
74HC/HCT7731N
74HC/HCT7731D
PINS
16
16
PACKAGE
PIN POSITION MATERIAL
DIL
SO16
plastic
plastic
CODE
SOT38Z
SOT109A
September 1993
2