HITACHI HD74BC245A

HD74BC245A
Octal Bus Transceivers With 3 State Outputs
ADE-205-008A (Z)
Rev. 1
March 1993
Description
The HD74BC245A 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 ten buffers 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 low, data flows from
the B inputs to the A outputs. When 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.
Built in input pull up circuit can make input pins be open, when not used.
TTL level input
Wide operating temperature range
Ta = –40 to + 85°C
Function Table
Control Inputs
G
DiR
Operation
L
L
B data to A bus
L
H
A data to B bus
H
X
Z
H :
L :
Z :
High level
Low level
High impedance
HD74BC245A
Pin Arrangement
DiR
1
20
VCC
A1
2
19
G
A2
3
18
B1
A3
4
17
B2
A4
5
16
B3
A5
6
15
B4
A6
7
14
B5
A7
8
13
B6
A8
9
12
B7
GND
10
11
B8
(Top view)
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage
VCC
–0.5 to +7.0
V
Input diode current
I IK
±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:
2
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.
HD74BC245A
Recommended Operating Conditions
Item
Symbol
Min
Typ
Max
Unit
Supply voltage
VCC
4.5
5.0
5.5
V
Input voltage
VIN
0
—
VCC
V
Output voltage
VOUT
0
—
VCC
V
Topr
–40
—
85
°C
t r, t f
0
—
8
ns/V
Operating temperature
1
Input rise/fall time*
Note:
1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
DiR
A1
G
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
3
HD74BC245A
Electrical Characteristics (Ta = –40°C to +85°C)
Item
Symbol
Input voltage
Output voltage
Min
Max
Unit
VIH
2.0
—
V
VIL
—
0.8
V
4.5
2.4
—
V
I OH = –3 mA
4.5
2.0
—
V
I OH = –15 mA
4.5
—
0.5
V
I OL = 48 mA
4.5
—
0.55
V
I OL = 64 mA
VOH
VOL
VCC(V)
Test Conditions
Input diode voltage
VIK
4.5
—
–1.2
V
I IN = –18 mA
Input current
II
5.5
—
–250
µA
VIN = 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 = 7.0 V
1
Short circuit output current*
I OS
5.5
–100
–225
mA
VO = 0 V, VIN = 5.5 V
Off state output current
I OZH
5.5
—
–100
µA
VO = 2.7 V
I OZL
5.5
—
–250
µA
VO = 0.5 V
I CCL
5.5
—
31.5
mA
VIN = 0 or 5.5 V
All outputs is “L”
I CCH
5.5
—
0.5
mA
VIN = 0 or 5.5 V
All outputs is “H”
I CCZ
5.5
—
4.5
mA
VIN = 0 or 5.5 V
All outputs is “Z”
I CCT*2
5.5
—
1.5
mA
VIN = 3.4 or 0.5 V
Supply current
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 CC increase at per one input pin.
4
HD74BC245A
Switching Test Method (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
t PLH
3.0
6.0
3.0
7.0
ns
An to Bn
t PHL
3.0
6.0
3.0
7.0
t PLH
3.0
6.0
3.0
7.0
ns
Bn to An
t PHL
3.0
6.0
3.0
7.0
t ZH
3.0
9.0
3.0
11.0
ns
G to Bn
t ZL
3.0
9.0
3.0
11.0
t ZH
3.0
9.0
3.0
11.0
ns
G to An
t ZL
3.0
9.0
3.0
11.0
t HZ
3.0
8.0
3.0
10.0
ns
G to Bn
t LZ
3.0
8.0
3.0
10.0
t HZ
3.0
8.0
3.0
10.0
ns
G to An
t LZ
3.0
8.0
3.0
10.0
Input capacitanse
CIN
3.0(Typ)
—
pF
VIN = VCC or GND
Output capacitance
CI/O
15.0(Typ)
—
pF
VI/O = VCC or GND
Output enable time
Output disable time
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
See Function Table
VCC
G
Output
A1
1.
2.
3.
4.
500 Ω
B1
DiR
Notes:
S1
CL=
50 pF
450 Ω
*4
OPEN
7V
50 Ω Scope
CL includes probe and jig capacitance.
A2-B2, A3-B3, A4-B4, A5-B5, A6-B6, A7-B7, A8-B8 are identical to above load circuit.
S1: Input-Output change switch.
Open: tPLH, t PHL , t ZH , t HZ
7 V: t ZL, t LZ
5
HD74BC245A
Waveforms-1
tr
tf
90%
1.5 V
Input
3V
90%
1.5 V
10%
t PLH
10%
0V
t PHL
VOH
1.5 V
Output
1.5 V
VOL
Waveforms-2
tf
tr
90%
1.5 V
G
90%
1.5 V
10%
10%
3V
0V
t LZ
t ZL
3.5 V
1.5 V
Waveform–A
VOL + 0.3 V
t ZH
VOH – 0.3 V
Waveform–B
VOL
t HZ
VOH
1.5 V
0V
Notes:
1.
2.
3.
4.
6
t r = 2.5 ns, tf = 2.5 ns
Input waveform: PRR = 1 MHz, duty cycle 50%
Waveform-A shows input conditions such that the output is “L” level when enable by the
output control.
Waveform-B shows input conditions such that the output is “H” level when enable by the
output control.
HD74BC245A
Package Dimensions
Unit: mm
7
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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