MOTOROLA MC74F1245N

MC74F1245
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
The MC74F1245 contains eight noninverting bidirectional buffers with
3-state outputs and is intended for bus-oriented applications. Current sinking
capability is 24 mA at the A ports and 64 mA at the B ports. The Transmit/
Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B
ports; Receive (active LOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports by placing them in a
high-Z condition.
• Noninverting Buffers
• Bidirectional Data Path
• B Outputs Sink 64 mA
• High Impedance Inputs for Reduced Loading
• Same Function and Pinout as the F245
• ESD Protection > 4000 Volts
FAST SCHOTTKY TTL
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
PIN ASSIGNMENT
VCC OE
20 19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
20
1
DW SUFFIX
SOIC
CASE 751D-03
20
1
1
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10
GND
LOGIC SYMBOL
2
3
4
5
6
7
8
ORDERING INFORMATION
9
MC74FXXXXJ Ceramic
MC74FXXXXN Plastic
MC74FXXXXDW SOIC
A0 A1 A2 A3 A4 A5 A6 A7
19
1
OE
T/R
B0 B1 B2 B3 B4 B5 B6 B7
18 17
16 15 14 13 12 11
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
DC Supply Voltage
74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
74
0
25
70
°C
IOH
Output Current  High
An Outputs
74
—
—
–3.0
mA
IOL
Output Current  Low
An Outputs
74
—
—
24
mA
IOH
Output Current  High
Bn Outputs
74
—
—
–15
mA
IOL
Output Current  Low
Bn Outputs
74
—
—
64
mA
FAST AND LS TTL DATA
4-264
MC74F1245
FUNCTION TABLE
Inputs/Outputs
Inputs
OE
T/R
An
Bn
L
L
A=B
Inputs
L
H
Inputs
B=A
H
X
Z
Z
H = HIGH voltage level: L = LOW voltage level: X = Don’t care: Z = HIGH impedance “off” state.
LOGIC DIAGRAM
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
VCC = PIN 20
GND = PIN 10
19
OE
T/R
1
18
B0
17
B1
16
B2
15
B3
FAST AND LS TTL DATA
4-265
14
B4
13
B5
12
B6
11
B7
MC74F1245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Test Conditions
(Note 1)
Min
Typ
Max
Unit
—
—
V
Guaranteed Input HIGH Voltage
VIH
Input HIGH Voltage
2.0
VIL
Input LOW Voltage
—
—
0.8
V
Guaranteed Input LOW Voltage
VIK
Input Clamp Diode Voltage
—
–0.73
–1.2
V
VCC = MIN, IIN = –18 mA
2.4
3.3
—
V
VOH
Output HIGH Voltage An Outputs
74
VOH
Output HIGH Voltage Bn Outputs
74
2.7
3.3
—
V
74
2.4
3.4
—
V
IOH = –3.0 mA
IOH = –3.0 mA
74
2.7
3.4
—
V
74
2.0
—
—
V
IOH = –15 mA
VCC = 4.5 V
VCC = 4.75 V
VCC = 4.5 V
VCC = 4.75 V
VCC = 4.5 V
VOL
Output LOW Voltage An Outputs
74
—
0.35
0.5
V
IOL = 24 mA
VOL
Output LOW Voltage Bn Outputs
74
—
—
0.55
V
IOL = 64 mA
IOZH
Output Off Current HIGH
—
—
70
µA
VCC = MAX
IOZL
Output Off Current LOW
—
—
–70
µA
VCC = MAX, VOUT = 0.5 V
OE, T/R Inputs
—
—
40
µA
VCC = MAX, VIN = 2.7 V
An, Bn Inputs
—
—
70
µA
VCC = MAX, VIN = 2.7 V
OE, T/R Inputs
—
—
100
µA
VCC = 0 V, VIN = 7.0 V
Bn Inputs
—
—
1.0
mA
VCC = 0 V, VIN = 5.5 V
An Inputs
—
—
2.0
mA
VCC = 0 V, VIN = 5.5 V
OE, T/R Inputs
—
—
–40
µA
An, Bn Inputs
—
—
–70
µA
An Outputs
–60
—
–150
mA
Bn Outputs
–100
—
–225
mA
ICCH
—
—
120
ICCL
—
—
120
ICCZ
—
—
130
IIH
Input HIGH Current
IIHH
Input HIGH Current
IIL
Input LOW Current
IOS
ICC
Output Short Circuit Current
(Note 2)
Power Supply Current
mA
VCC = MIN
VOUT = 2.7 V
VCC = MAX, VIN = 0.5 V
VCC = MAX, VOUT = GND
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
74F
74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
TA = 0°C to +70°C
VCC = +5.0 V ±10%
CL = 50 pF
Min
Max
Min
Max
Unit
tPLH
tPHL
Propagation Delay
Transparent Mode An to Bn or Bn to An
2.0
2.5
6.5
7.5
1.5
2.0
7.0
8.0
ns
tPZH
tPZL
Output Enable Time
3.0
4.0
8.0
10.0
2.5
3.5
9.0
11.0
ns
tPHZ
tPLZ
Output Disable Time
2.0
1.0
8.0
10.0
1.5
1.0
9.0
11.0
ns
FAST AND LS TTL DATA
4-266