74HCT646D NXP Semiconductors, 74HCT646D Datasheet - Page 4

• Manufacturer Part Number: 74HCT646D
• Description: Bus Transceivers OCTAL TRANSCEIVER/ REGISTER 3-S
• Manufacturer: NXP Semiconductors

Specifications of 74HCT646D

• Logic Type: CMOS
• Logic Family: HCT
• Number Of Channels Per Chip: 8
• Input Level: TTL
• Output Level: CMOS
• Output Type: 3-State
• High Level Output Current: - 6 mA
• Low Level Output Current: 6 mA
• Propagation Delay Time: 44 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 125 C
• Package / Case: SO-24
• Function: Bus Transceiver / Register
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Circuits: 1
• Polarity: Non-Inverting
• Lead Free Status / Rohs Status: Details
• Other names: 74HCT646D,652

Philips Semiconductors
FUNCTION TABLE
Notes
1. H = HIGH voltage level
2. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input
September 1993
H
H
L
L
L
L
Octal bus transceiver/register; 3-state
OE
L = LOW voltage level
X = don’t care
functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock
inputs.
= LOW-to-HIGH level transition
X
X
L
L
H
H
DIR
Fig.4 Functional diagram.
H or L
X
X
X
H or L
CP
INPUTS
AB
H or L
X
H or L
X
X
CP
(1)
BA
X
X
X
X
L
H
S
AB
X
X
L
H
X
X
S
BA
input
output
input
A
4
0
to A
DATA I/O
7
input
input
output
B
0
(2)
to B
7
FUNCTION
isolation
store A and B data
real-time B data to A bus
stored B data to A bus
real-time A data to B bus
stored A data to B bus
74HC/HCT646
Product specification