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PDF HD74HCT623 Data sheet ( Hoja de datos )
| Número de pieza | HD74HCT623 | |
| Descripción | Octal Bus Transceivers (with inverted 3-state outputs)/ | |
| Fabricantes | Hitachi Semiconductor | |
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HD74HCT620/HD74HCT623
Octal Bus Transceivers (with inverted 3-state outputs)/
Octal Bus Transceivers (with 3-state outputs)
Description
This octal transceiver is designed for asynchronous two-way communication between data buses. The
control function implementation allows for maximum flexibility in timng.
This device allows data transmission from A bus to the B bus or from the B bus to the A bus depending
upon the logic levels at the enable inputs (GBA and GAB).
The enable inputs can be used to disable the device so that the buses are affectively isolated.
The dual-enable configuration gives these devices the capability to store data by simultaneous enabling of
GBA and GAB. Each output reinforces its input in this transceiver configuration. Thus, when both control
inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of
bus lines (16 in all) will remain at their last states. The 8-bit codes appearing on the two sets of buses will
be identical for the HD74HCT623 or complementary for the HD74HCT620.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (Bus to Bus) = 15 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
1 page  
HD74HCT620/HD74HCT623
DC Characteristics
Ta = 25°C
Ta = –40 to
+85°C
Test Conditions
Item
Input voltage
Symbol Min Typ Max Min
VIH 2.0 — — 2.0
Max
—
Unit
V
VCC (V)
4.5 to
5.5
VIL — — 0.8 — 0.8 V 4.5 to
5.5
Output voltage
VOH
VOL
Off-state output
current
Input current
Quiescent supply
current
I OZ
Iin
I CC
4.4 — — 4.4 — V
4.18 — — 4.13 —
— — 0.1 — 0.1 V
— — 0.26 — 0.33
— — ±0.5 — ±5.0 µA
4.5
4.5
4.5
4.5
5.5
— — ±0.1 —
— — 4.0 —
±1.0 µA
40 µA
5.5
5.5
Vin = VIH or VIL IOH = –20 µA
IOH = –6 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 6 mA
Vin = VIH or VIL,
Vout = VCC or GND
Vin = VCC or GND
Vin = VCC or GND, Iout = 0 µA
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Item
Symbol
Propagation delay tPLH
time
t PHL
Output enable
t ZH
time
t ZL
Output disable
t HZ
time
t LZ
Output rise/fall
time
t TLH
t THL
Input capacitance Cin
Ta = 25°C
Ta = –40 to
+85°C
Min Typ Max Min Max
— 13 20 — 25
— 16 20 — 25
— 16 30 — 38
— 16 30 — 38
— 19 30 — 38
— 21 30 — 38
— 4 12 — 15
— 5 10 — 10
Unit
ns
ns
ns
ns
pF
Test Conditions
VCC (V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
—
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74HCT623.PDF ] | |
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