74245 Transceiver Datasheet

74245 Datasheet, PDF, Equivalent


Part Number

74245

Description

3-STATE Octal Bus Transceiver

Manufacture

Fairchild Semiconductor

Total Page 6 Pages
Datasheet
Download 74245 Datasheet


74245
August 1986
Revised March 2000
DM74LS245
3-STATE Octal Bus Transceiver
General Description
These octal bus transceivers are designed for asynchro-
nous two-way communication between data buses. The
control function implementation minimizes external timing
requirements.
The 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 level at the direction control (DIR) input. The enable
input (G) can be used to disable the device so that the
buses are effectively isolated.
Features
s Bi-Directional bus transceiver in a high-density 20-pin
package
s 3-STATE outputs drive bus lines directly
s PNP inputs reduce DC loading on bus lines
s Hysteresis at bus inputs improve noise margins
s Typical propagation delay times, port-to-port 8 ns
s Typical enable/disable times 17 ns
s IOL (sink current)
24 mA
s IOH (source current)
15 mA
Ordering Code:
Order Number Package Number
Package Description
DM74LS245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS245N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Enable
G
L
L
H
H = HIGH Level
L = LOW Level
X = Irrelevant
Direction
Control
DIR
L
H
X
Operation
B Data to A Bus
A Data to B Bus
Isolation
© 2000 Fairchild Semiconductor Corporation DS006413
www.fairchildsemi.com

74245
Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
DIR or G
7V
A or B
5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Min
4.75
2
0
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Nom
5
Min
VI
HYS
VOH
VOL
IOZH
IOZL
Input Clamp Voltage
Hysteresis (VT+ VT)
HIGH Level
Output Voltage
LOW Level
Output Voltage
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
VCC = Min, II = −18 mA
VCC = Min
VCC = Min, VIH = Min
VIL = Max, IOH = −1 mA
VCC = Min, VIL = Min
VIL = Max, IOH = −3 mA
VCC = Min, VIH = Min
VIL = 0.5V, IOH = Max
VCC = Min
IOL = 12 mA
VIL = Max
VIH = Min
IOL = Max
VCC = Max
VIL = Max
VO = 2.7V
VIH = Min
VO = 0.4V
II
Input Current at Maximum
VCC = Max
A or B
VI = 5.5V
Input Voltage
DIR or G VI = 7V
IIH
HIGH Level Input Current
VCC = Max, VI = 2.7V
IIL
LOW Level Input Current
VCC = Max, VI = 0.4V
IOS
Short Circuit Output Current
VCC = Max (Note 3)
ICC Supply Current
Outputs HIGH
Outputs LOW
VCC = Max
Outputs at Hi-Z
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, not to exceed one second duration
0.2
2.7
2.4
2
40
Max
Units
5.25
V
V
0.8 V
15 mA
24 mA
70 °C
Typ
(Note 2)
0.4
Max
1.5
Units
V
V
3.4 V
0.4
V
0.5
20 µA
200
µA
0.1
mA
0.1
20 µA
0.2 mA
225
mA
48 70
62 90 mA
64 95
www.fairchildsemi.com
2


Features DM74LS245 3-STATE Octal Bus Transceiver August 1986 Revised March 2000 DM74LS 245 3-STATE Octal Bus Transceiver Gener al Description These octal bus transcei vers are designed for asynchronous two- way communication between data buses. T he control function implementation mini mizes external timing requirements. The device allows data transmission from t he A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control (DIR) in put. The enable input (G) can be used t o disable the device so that the buses are effectively isolated. Features s B i-Directional bus transceiver in a high -density 20-pin package s 3-STATE outpu ts drive bus lines directly s PNP input s reduce DC loading on bus lines s Hyst eresis at bus inputs improve noise marg ins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disa ble times 17 ns s IOL (sink current) 24 mA s IOH (source current) −15 mA Or dering Code: Order Number DM74LS245WM DM74LS245SJ DM74LS245N Pack.
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