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M74HCT652 データシート(PDF) 1 Page - STMicroelectronics

部品番号 M74HCT652
部品情報  HCT651 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV. HCT652 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M74HCT651
M74HCT652
October 1993
HCT652 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE)
HCT651 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
.
HIGH SPEED
fMAX = 60 MHz (TYP.) AT VCC =5V
.
COMPATIBLE WITH TTL OUTPUTS
VIH = 2 V (MIN.) AT VIL = 0.8V (MAX)
.
LOW POWER DISSIPATION
ICC =4
µA (MAX) AT TA =25 oC
.
OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL = 6 mA (mIN.)
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS651/652
DESCRIPTION
M74HCT651/652 are high speed CMOS OCTAL
BUS
TRANSCEIVERS
AND
REGISTERS
(3-STATE), fabricated in silicon gate C
2MOS
technology. They have the same high speed
performance of LSTTL combined with true CMOS
low power consumption. These devices consist of
bus transceiver circuits, D-type flip-flops, and control
circuitry arranged for multiplexed transmission of
data directly from the input bus or from the internal
storage registers. Enable GAB and GBA are
provided to control the transceiver functions. Select
AB and Select BA control pins are provided to select
whether real-time or stored data is transfered. A low
input level selects real-time data, and a high selects
stored data. Data on the A or B bus, or both, can be
stored in the internal D flip-flops by low-to-high
transitions at the appropriate clock pins (CLOCK AB
or CLOCK BA) regardless of the select or enable
control pins. When select AB and select BA are in the
real-time transfer mode, it is also possible to store
data without using the internal D-type flip-flops by
simultaneously enabling GAB and GBA. In this
configuration each output reinforces its input. Thus,
when all other data sources to the two sets of bus
lines are at high impedance, each set of bus lines will
remain at its last state. All inputs are equipped with
protection circuits against static discharge and
transient excess voltage.This integrated circuit has
input and output characteristics that are fully
compatible
with 54/74
LSTTL
logic
families.
M54/74HCT devices are designed to directly
interface HSCMOS systems with TTL and NMOS
components. They are also plug in replacements for
LSTTL devices giving a reduction of power
consumption.
GAB, GAB, CAB,
A, B
SAB, SBA, CBA
B1R
(Plastic Package)
ORDER CODES :
M74HCXXXM1R
M74HCXXXB1R
M1R
(Micro Package)
PIN CONNECTIONS (top view)
1/12


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