Document
HD74HC620/HD74HC623
Octal Bus Transceivers (with inverted 3-state outputs) Octal Bus Transceivers (with 3-state outputs)
Description
This octal bus transceiver is designed for asynchronous two-way communication between data buses. The control fuction implementation allows for maximum flexibility in timing. This device allows data transmission from the 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 effectively 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 HD74HC623 or coplementary for the HD74HC620.
Features
• • • • • High Speed Operation: tpd (Bus to Bus) = 12 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)
Function Table
Enable Inputs GBA L H H L GAB L H L H Operation HD74HC620 B data to A bus A data to B bus Isolation B data to A bus, A data to B bus HD74HC623 B data to A bus A data to B bus Isolation B data to A bus, A data to B bus
HD74HC620/HD74HC623
Pin Arrangement
Enable GAB 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9 GND 10 (Top view)
20 VCC 19 Enable GBA 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
Absolute Maximum Ratings
Item Supply voltage range Input voltage Output voltage Output current DC current drain per VCC GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating –0.5 to +7.0 –0.5 to VCC + 0.5 –0.5 to VCC + 0.5 ±35 ±75 ±20 ±20 500 –65 to +150 Unit V V V mA mA mA mA mW °C
2
HD74HC620/HD74HC623
Block Diagram
HD74HC620
GBA GAB VCC
A1 VCC
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
3
HD74HC620/HD74HC623
HD74HC623
GBA GAB VCC
A1 VCC
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
4
HD74HC620/HD74HC623
DC Characteristics
Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±5.0 ±1.0 40 µA µA µA I OL = 6 mA I OL = 7.8 mA Vin = VIH or VIL, Vout = VCC or GND Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –6 mA I OH = –7.8 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 — 3.15 — 4.2 — — — — — — — — — — 0.5 1.5 3.15 4.2 —
VIL
2.0 4.5 6.0
1.35 — 1.8 — 1.9 4.4 5.9 4.13 5.63 — — —
Output voltage
VOH
2.0 4.5 6.0 4.5 6.0
1.9 2.0 — 4.4 4.5 — 5.9 6.0 — 4.18 — 5.68 — — — — — — — — — — —
VOL
2.0 4.5 6.0 4.5 6.0
0.0 0.1 0.0 0.1 0.0 0.1 — — — — —
0.26 — 0.26 — ±0.5 — ±0.1 — 4.0 —
Off-state output current Input current Quiescent supply current
I OZ Iin I CC
6.0 6.0 6.0
5
HD74HC620/HD74HC623
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C Item Symbol Ta = –40 to +85°C Max 125 25 21 190 38 33 190 38 33 75 15 13 10 pF ns ns ns Unit ns Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 — — — — — — — — — — — — — — 12 — — 12 — — 16 — — 4 — 5 100 — 20 17 — —
Propagation delay t PLH time t PHL
Output enable time
t ZH t ZL
2.0 4.5 6.0
150 — 30 26 — —
Output disable time
t HZ t LZ
2.0 4.5 6.0
150 — 30 26 60 12 10 10 — — — — — —
Output rise/fall time
t TLH t THL
2.0 4.5 6.0
Input capacitance
Cin
—
6
Unit: mm
24.50 25.40 Max 20 11 7.00 Max 6.30 1 0.89
1.27 Max
10 1.30 2.54 Min 5.08 Max 7.62
0.51 Min
2.54 ± 0.25
0.48 ± 0.10
0.25 – 0.05 0° – 15°
+ 0.11
Hitachi Code JEDEC EIAJ Weight (reference value)
DP-20N — Conforms 1.26 g
Unit: mm
12.6 13 Max
20
11
1
10
5.5
0.80 Max
2.20 Max
*0.22 ± 0.05 0.20 ± 0.04
0.20 7.80 + – 0.30
1.15
1.27 *0.42 ± 0.08 0.40 ± 0.06
0.10 ± 0.10
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness Base material dimension
Hitachi Code JEDEC EIAJ Weight (reference value)
FP-20DA — Conforms 0.31 g
Unit: mm
12.8 13.2 Max 20 11 7.50 1 0.935 Max 10
2.65 Max
*0.27 ± 0.05 0.25 ± 0.04
0.25 10.40 + – 0.40
1.45 0° – 8°
0.57 0.70 + – 0.30
1.27
*0.42 ± 0.08 0.40 ± 0.06
0.12 M
*Dimension including the plating thickness Base material dimension
0.20 ± 0.10 0.15
Hitachi Code JEDEC EIAJ Weight (reference value)
FP-20DB Conforms — 0.52 g
Cautions
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