HD74BC640A
Octal Bus Transceivers With 3 State Outputs
ADE-205-026 (Z)
1st. Edition
Feb. 1994
Description
The HD74BC640A 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. Each device has an active low enable input (G) and a direction
control input, DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is high,
data flows from the B inputs to the A outputs. When enable inputs (G) is high, disables both A and B ports
by placing then in a high impedance.
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
Control Inputs
GDIR Operation
LL B data to A bus
LH A data to B bus
H X Isolation
H : High level
L : Low level
X : Immaterial
HD74BC640A
2
Pin Arrangement
(Top view)
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20 VCC
G
B1
B2
B3
B4
B5
B6
B7
B8
DiR
A1
A2
A3
A4
A5
A6
A7
A8
GND
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage VCC –0.5 to +7.0 V
Input diode current IIK ±30 mA
Input voltage VIN –0.5 to +7.5 V
Output voltage VOUT –0.5 to +7.5 V
Off state output voltage VOUT(off) –0.5 to +5.5 V
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.
HD74BC640A
3
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage VCC 4.5 5.0 5.5 V
Input voltage VIN 0—V
CC V
Ouput voltage VOUT 0—V
CC V
Operating temperature Topr –40 — 85 °C
Input rise/fall time*1tr, tf0 — 8 ns/V
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
B1
B2
B3
B4
B5
B6
B7
A8
A7
A6
A5
A4
A2
A1
DiR
B8
A3
G
HD74BC640A
4
Electrical Characteristics (Ta = –40 to +85°C)
Item Symbol VCC (V) Min Max Unit Test Conditions
Input voltage VIH 2.0 — V
VIL — 0.8 V
Output voltage VOH 4.5 2.4 — V IOH = –3 mA
4.5 2.0 — V IOH = –15 mA
VOL 4.5 — 0.5 V IOL = 48 mA
4.5 — 0.55 V IOL = 64 mA
Input diode voltage VIK 4.5 — –1.2 V IIN = –18 mA
Input current II5.5 — –250 µAV
IN = 0 V
5.5 — 100 µA An or Bn, VIN = 5.5 V
5.5 — 1.0 µA DiR or G, VIN = 5.5 V
5.5 — 100 µA DiR or G, VIN = 7 V
Output short circuit current*1IOS 5.5 –100 –225 mA VO = 0 V, VIN = 0 or 5.5 V
Off state output current IOZH 5.5 — –100 µAV
O
= 2.7 V
IOZL 5.5 — –250 µAV
O
= 0.5 V
Supply current ICCL 5.5 — 29.5 mA VIN = 0 or 5.5 V
All outputs is “L”
ICCH 5.5 — 2.5 mA VIN = 0 or 5.5 V
All outputs is “H”
ICCZ 5.5 — 4.5 mA VIN = 0 or 5.5 V
All outputs is “Z”
ICCT*25.5 — 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 ICC increase at per one input pin.
HD74BC640A
5
Switching Characteristics (CL = 50 pF)
Ta = 25°C
VCC = 5.0 V Ta = –40 to +85°C
VCC = 5.0 V ±10%
Item Symbol Min Max Min Max Unit Test Conditions
Propagation delay time tPLH 3.0 6.0 3.0 7.0 ns An to Bn
tPHL 3.0 6.0 3.0 7.0
tPLH 3.0 6.0 3.0 7.0 ns Bn to An
tPHL 3.0 6.0 3.0 7.0
Output enable time tZH 3.0 9.0 3.0 11.0 ns G to Bn
tZL 3.0 9.0 3.0 11.0
tZH 3.0 9.0 3.0 11.0 ns G to An
tZL 3.0 9.0 3.0 11.0
Output disable time tHZ 3.0 8.0 3.0 10.0 ns G to Bn
tLZ 3.0 8.0 3.0 10.0
tHZ 3.0 8.0 3.0 10.0 ns G to An
tLZ 3.0 8.0 3.0 10.0
Input capacitance CIN 3.0 (Typ) — pF VIN = VCC or GND
Output capacitance CI/O 15.0 (Typ) — pF VI/O = VCC or GND
HD74BC640A
6
Test Circuit
C =
50 pF
L
Input Output
500 Ω
DIR
A1
B1
VCC
Pulse
Generator
Z = 50 Ω
out
VCC
See Function Table
450 Ω
*4
S1
50 Ω
Scope
OPEN
7V
G
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: tPLH, tPHL, tZH tHZ
7 V: tZL, tLZ
Waveforms-1
tPLH tPHL
VOH
VOL
Input
Output
10 % 0 V
3 V
10 %
1.5 V
90 %
1.5 V
tftr
90 %
1.5 V
1.5 V
HD74BC640A
7
Waveforms-2
V – 0.3 V
OH
V + 0.3 V
OL
tZL
1.5 V
tLZ
tZH
1.5 V
tHZ
tftr
90 %
1.5 V
10 %
90 %
1.5 V
10 %
VOH
VOL
0 V
3.5 V
3 V
0 V
Waveform – A
Waveform – B
G
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.
HD74BC640A
8
Package Dimensions
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
DP-20N
—
Conforms
1.26 g
Unit: mm
0.51 Min
2.54 Min 5.08 Max
7.62
0.25
+ 0.11
– 0.05
2.54 ± 0.25 0.48 ± 0.10
24.50
25.40 Max
0.89 1.30
6.30
7.00 Max
110
1120
0° – 15°
1.27 Max
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
FP-20DA
—
Conforms
0.31 g
Unit: mm
*Dimension including the plating thickness
Base material dimension
*0.42 ± 0.08
0.12
0.15
M
20
10
1
*0.22 ± 0.05
0.80 Max
11
12.6
5.5
2.20 Max
13 Max
0° – 8°
0.70 ± 0.20
+ 0.20
– 0.30
7.80
1.27
0.10 ± 0.10
1.15
0.40 ± 0.06
0.20 ± 0.04
HD74BC640A
9
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
FP-20DB
Conforms
—
0.52 g
Unit: mm
*Dimension including the plating thickness
Base material dimension
0.12
0.15
0° – 8°
M
20 11
0.20 ± 0.10
1
1.27
10
12.8
13.2 Max
7.50
2.65 Max
*0.27 ± 0.05
*0.42 ± 0.08
+ 0.57
– 0.30
0.70
+ 0.25
– 0.40
10.40
1.45
0.935 Max
0.40 ± 0.06
0.25 ± 0.04
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
TTP-20DA
—
—
0.07 g
Unit: mm
*Dimension including the plating thickness
Base material dimension
0.50 ± 0.10
0° – 8°
*0.17 ± 0.05
6.40 ± 0.20
0.10
1.10 Max
0.13 M
0.65
110
20 11
4.40
6.50
6.80 Max
*0.22
+0.08
–0.07
0.07
+0.03
–0.04
1.0
0.65 Max
0.20 ± 0.06
0.15 ± 0.04
HD74BC640A
10
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 fail-
safes, 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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Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
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