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74HC165N-74HC165PW-74HCT165D-74HCT165N
8-bit parallel-in/serial-out shift register
Philips Semiconductors Product specification
8-bit parallel-in/serial-out shift register 74HC/HCT165
FEATURES Asynchronous 8-bit parallel load Synchronous serial input Output capability: standard ICC category: MSI
GENERAL DESCRIPTIONThe 74HC/HCT165 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT165 are 8-bit parallel-load or serial-in shift
registers with complementary serial outputs (Q7 and
Q7) available from the last stage. When the parallel load
(PL) input is LOW, parallel data from the D0to inputs are loaded into the register asynchronously.
WhenPL is HIGH, data enters the register serially at the input and shifts one place to the right
(Q0→Q1→ Q2, etc.) with each positive-going clock
transition. This feature allows parallel-to-serial converter
expansion by tying the Q7 output to the DS input of the
succeeding stage.
The clock input is a gated-OR structure which allows one
input to be used as an active LOW clock enable (CE) input.
The pin assignment for the CP and CE inputs is arbitrary
and can be reversed for layout convenience. The
LOW-to-HIGH transition of input CE should only take
place while CP HIGH for predictable operation. Either the
CP or the CE should be HIGH before the
LOW-to-HIGH transition ofPL to prevent shifting the data
whenPL is activated.
APPLICATIONS Parallel-to-serial data conversion
QUICK REFERENCE DATAGND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes CPD is used to determine the dynamic power dissipation (PDin μW): = CPD× VCC2×fi +∑ (CL× VCC2×fo) where: = input frequency in MHz = output frequency in MHz (CL× VCC2×fo) = sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC− 1.5 V
ORDERING INFORMATION
Philips Semiconductors Product specification
8-bit parallel-in/serial-out shift register 74HC/HCT165
PIN DESCRIPTION
Philips Semiconductors Product specification
8-bit parallel-in/serial-out shift register 74HC/HCT165
FUNCTION TABLE
Note H = HIGH voltage level = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition = LOW voltage level= LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition= lower case letters indicate the state of the referenced output one set-up time prior to the
LOW-to-HIGH clock transition
X = don’t care= LOW-to-HIGH clock transition
Philips Semiconductors Product specification
8-bit parallel-in/serial-out shift register 74HC/HCT165
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR HCGND = 0 V; tr = tf = 6 ns; CL = 50 pF
Philips Semiconductors Product specification
8-bit parallel-in/serial-out shift register 74HC/HCT165
