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HD74BC620A
Octal Bus Transceivers With 3 State Outputs
ADE-205-024 (Z)
Rev. 0
June 1993
Description
The HD74BC620A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC. When the frequency is 10 MHz. The device has eight bus transceivers with
three state outputs in a 20 pin package. 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.
Features
• Input/Output are at high impedance state when power supply is off.
• Input pins can be open, when not used, owing to built in input pull up circuit.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Enable Inputs
GBA GAB Operation
LL B data to A bus
HH A data to B bus
H L Isolation
LH B data to A bus
A data to B bus
H : High level
L : Low level
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HD74BC620A
A
Pin Arrangement
GAB
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
GB
B1
B2
B3
B4
B5
B6
B7
B8
CC
(Top view)
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V
CC
IK
IN
OUT
OUT(off)
Storage temperature Tstg –65 to +150 °C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
–0.5 to +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V
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HD74BC620A
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage V
Input voltage V
Ouput voltage V
CC
IN
OUT
Operating temperature Topr –40 — 85 °C
Input rise/fall time*
1
tr, t
f
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
GBA
GAB
4.5 5.0 5.5 V
0—VCCV
0—VCCV
0 — 8 ns/V
A1
A2
A3
A8
B1
B2
B3
B8
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HD74BC620A
Electrical Characteristics (Ta = –40 to +85°C)
Item Symbol VCC (V) Min Max Unit Test Conditions
Input voltage V
Output voltage V
IH
V
IL
OH
4.5 2.4 — V IOH = –3 mA
4.5 2.0 — V IOH = –15 mA
V
OL
4.5 — 0.5 V IOL = 48 mA
4.5 — 0.55 V IOL = 64 mA
Input diode voltage V
Input current I
IK
I
4.5 — –1.2 V IIN = –18 mA
5.5 — –250 µAVIN = 0 V
5.5 — 1.0 µA GAB or GBA, VIN = 5.5 V
5.5 — 100 µA An or Bn, VIN = 5.5 V
5.5 — 100 µA GAB or GBA = 7 V
Output short circuit current*1I
Off state output current I
Supply current I
OS
OZH
I
OZL
CCL
I
CCH
I
CCZ
2
I
*
CCT
5.5 –100 –225 mA VIN = 0 or 5.5 V
5.5 — –100 µAV
5.5 — –250 µAV
5.5 — 29.5 mA VIN = 0 or 5.5 V
5.5 — 2.5 mA VIN = 0 or 5.5 V
5.5 — 4.5 mA VIN = 0 or 5.5 V
5.5 — 1.5 mA VIN = 3.4 or 0.5 V
Notes: 1. Not more than one output should be shorted at a time and duration of the short circuit should not
exceed one second.
2. When input by the TTL level, it shows I
2.0 — V
— 0.8 V
increase at per one input pin.
CC
= 2.7 V
O
= 0.5 V
O
All outputs is “L”
All outputs is “H”
All outputs is “Z”
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Switching Characteristics (CL = 50 pF)
HD74BC620A
Ta = 25°C
V
= 5.0 V
CC
Ta = –40 to +85°C
VCC = 5.0 V ±10%
Item Symbol Min Max Min Max Unit Test Conditions
Propagation delay time t
Output enable time t
Output disable time t
Input capacitance C
Output capacitance C
PLH
t
PHL
t
PLH
t
PHL
ZH
t
ZL
t
ZH
t
ZL
HZ
t
LZ
t
HZ
t
LZ
IN
I/O
3.0 6.0 3.0 7.0 ns An to Bn
3.0 6.0 3.0 7.0
3.0 6.0 3.0 7.0 ns Bn to An
3.0 6.0 3.0 7.0
3.0 9.0 3.0 11.0 ns GAB to Bn
3.0 9.0 3.0 11.0
3.0 9.0 3.0 11.0 ns GBA to An
3.0 9.0 3.0 11.0
3.0 8.0 3.0 10.0 ns GAB to Bn
3.0 8.0 3.0 10.0
3.0 8.0 3.0 10.0 ns GBA to An
3.0 8.0 3.0 10.0
3.0 (Typ) — pF VIN = VCC or GND
15.0 (Typ) — pF V
= VCC or GND
I/O
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HD74BC620A
Test Circuit
V
CC
V
CC
GBA
Input
A1
Pulse
Generator
Z = 50 Ω
out
B1
See Function Table
GAB
Notes: 1. CL includes probe and jig capacitance.
2. A2-B2 to A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: t
7 V: tZL, t
PLH
, t
, tZH t
PHL
LZ
HZ
Waveforms-1
S1
Output
C =
L
50 pF
500 Ω
450 Ω
50 Ω
Scope
OPEN
7V
*4
Input
Output
90 %
1.5 V
10 %
t
f
t
PLH
1.5 V
t
r
1.5 V
10 %
t
1.5 V
90 %
PHL
3 V
0 V
V
V
OH
OL
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Waveforms-2
HD74BC620A
GAB
Waveform – A
Waveform – B
Waveforms-3
GBA
Waveform – A
Waveform – B
90 %
1.5 V
10 %
t
r
1.5 V
10 %
t
f
90 %
t
t
t
t
ZL
ZH
ZL
ZH
1.5 V
1.5 V
1.5 V
1.5 V
90 %
1.5 V
10 %
t
f
t
r
10 %
90 %
1.5 V
3 V
0 V
t
LZ
3.5 V
V + 0.3 V
OL
t
HZ
V – 0.3 V
OH
V
OL
V
OH
0 V
3 V
0 V
t
LZ
3.5 V
V + 0.3 V
OL
t
HZ
V – 0.3 V
OH
V
OL
V
OH
0 V
Notes: 1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
3. Waveform-A shows input conditions such that the output is “L” level when enable by the output
control.
4. Waveform-B shows input conditions such that the output is “H” level when enable by the output
control.
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HD74BC620A
Package Dimensions
Unit: mm
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Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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