HD74HC646 PDF даташит
Спецификация HD74HC646 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «Octal Bus Transceivers/Registers with Multiplexed 3-state outputs». |
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Детали детали
Номер произв | HD74HC646 |
Описание | Octal Bus Transceivers/Registers with Multiplexed 3-state outputs |
Производители | Hitachi Semiconductor |
логотип |
10 Pages
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HD74HC646/HD74HC648
Octal Bus Transceivers/Registers with Multiplexed 3-state outputs
Description
Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a
combination of both. As a latched transceiver, data from one bus is stored for later retrieval by the other
bus. Alternately real time bus data (unlatched) may be directly transferred from one bus to another.
Circuit operation is determined by the Control G, Direction, Clock AB, Clock BA, Select AB, Select BA
control inputs. The enable input, Contorl G, controls whether any bus outputs are enabled. The direction
control Direction (DIR), determines which bus is enabled, and hence the direction data flows: The Select
AB, Select BA inputs cotrol whether the latched data (stored in D type flip-flops), or the bus data (from
other bus input pins) is transferred. Each set of flip-flops has its own clock Clock AB and Clock BA, for
storing data. Data is latched on the rising edge of the clock.
Features
• High Speed Operation: tpd (Bus to Bus) = 14 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
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HD74HC646/HD74HC648
Function Table
Inputs
Control
Clock Select Data I/O Data I/O Operation or Function
G Direction BA AB AB BA A1 thru A8 B1 thru B8 HD74HC646
HD74HC648
HX
X X X X Z (Input) Z (Input) Isolation
Isolation
HX
H H Z (Input) Z (Input) Store A & B data Store A & B data
LL
X X X L Output
Z (Input) B real-time data to B real-time data to
A bus
A bus
LL
H H X H Output
Z (Input) B stored data to A B stored data to A
bus bus
LL
L L X H Output
Z (Input) B stored data to A B stored data to A
bus bus
LH
X X L X Z (Input) Output
A real-time data to A real-time data to
B bus
B bus
LH
H H H X Z (Input) Output
A stored data to B A stored data to B
bus bus
LH
L L H X Z (Input) Output
A stored data to B A stored data to B
bus bus
Real-time transfer
Bus B to Bus A
Real-time transfer
Bus A to Bus B
2
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HD74HC646/HD74HC648
Storage from
A, B, or A and B
Pin Arrangement
Transfer stored data
to A or B
Clock AR 1
Select AB 2
Direciton 3
A1 4
A2 5
A3 6
A4 7
A5 8
A6 9
A7 10
A8 11
GND 12
24 VCC
23 Clock BA
22 Select BA
21 Control G
20 B1
19 B2
18 B3
17 B4
16 B5
15 B6
14 B7
13 B8
(Top view)
3
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Номер в каталоге | Описание | Производители |
HD74HC640 | Octal Bus Transceivers (with 3-state outputs) | Hitachi Semiconductor |
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HD74HC643 | Octal Bus Transceivers (with 3-state outputs) | Hitachi Semiconductor |
HD74HC643 | Octal Bus Transceivers | Renesas |
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DataSheet26.com | 2020 | Контакты | Поиск |