INTEGRATED CIRCUITS
74F245
Octal transceiver (3-State)
Product specification
IC15 Data Handbook
1994 Nov 15
Philips Semiconductors
Philips Semiconductors
Product specification
Octal transceiver (3-State)
74F245
FEATURES
•
Octal bidirectional bus interface
•
3-State buffer outputs sink 64mA
•
15mA source current
•
Outputs are placed in high impedance state during power-off
conditions
PIN CONFIGURATION
T/R 1
A0
A1
A2
A3
A4
2
3
4
5
6
7
8
9
20 V
CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
DESCRIPTION
The 74F245 is an octal transceiver featuring non-inverting 3-State
bus compatible outputs in both transmit and receive directions. The
B port outputs are capable of sinking 64mA and sourcing 15mA,
producing very good capacitive drive characteristics. The device
features an Output Enable (OE) input for easy cascading and
Transmit/Receive (T/R) input for direction control. The 3-State
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
TYPE
74F245
TYPICAL PROPAGATION DELAY
4.0ns
A5
A6
A7
GND 10
SF00198
TYPICAL SUPPLY CURRENT (TOTAL)
70mA
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic DIP
20-Pin Plastic SO
20-Pin Plastic SSOP Type II
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F245N
N74F245D
N74F245DB
DRAWING NUMBER
SOT146-1
SOT163-1
SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
A0–A7, B0–B7
OE
T/R
A0–A7
B0–B7
Data inputs
Output Enable input (active Low)
Transmit/Receive input
A port outputs
B port outputs
DESCRIPTION
74F (U.L.) HIGH/LOW
3.5/1.0
1.0/2.0
1.0/2.0
150/40
750/106.7
LOAD VALUE HIGH/LOW
70µA/0.6mA
20µA/1.2mA
20µA/1.2mA
3.0mA/24mA
15mA/64mA
NOTE:
One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
2
3
4
5
6
7
8
9
IEC/IEEE SYMBOL
19
1
G3
3EN1 (BA)
3EN1 (AB)
∇
1
A0
19
1
OE
T/R
B0
B1
B2
B3
B4
B5
B6
B7
A1
A2
A3
A4
A5
A6
A7
2
3
4
5
6
7
18
V
CC
= Pin 20
GND = Pin 10
17
16
15
14
13
12
11
8
9
2
∇
18
17
16
15
14
13
12
11
SF00199
SF00200
November 15, 1994
2
853–0025 14256
Philips Semiconductors
Product specification
Octal transceiver (3-State)
74F245
LOGIC DIAGRAM
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
OE
19
1
18
B0
17
B1
16
B2
15
B3
14
B4
13
B5
12
B6
11
B7
T/R
V
CC
= Pin 20
GND = Pin 10
SF00201
FUNCTION TABLE
INPUTS
OE
L
L
H
T/R
L
H
X
OUTPUTS
Bus B data to Bus A
Bus A data to Bus B
Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
A0–A7
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature range
B0–B7
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to +5.5
48
128
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
O
OH
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
A0–A7
High-level
High level output current
B0–B7
A0–A7
I
O
OL
T
amb
Low-level
Low level output current
Operating free-air temperature range
B0–B7
0
PARAMETER
MIN
4.5
2.0
0.8
–18
–3
–15
24
64
+70
NOM
5.0
MAX
5.5
UNIT
V
V
V
mA
mA
mA
mA
mA
°C
November 15, 1994
3
Philips Semiconductors
Product specification
Octal transceiver (3-State)
74F245
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
±10%
V
CC
±5%
V
CC
±10%
V
CC
±5%
V
CC
±10%
V
CC
±5%
V
CC
±10%
V
CC
±5%
V
CC
0.42
–0.73
LIMITS
MIN
2.4
2.7
2.0
2.0
0.30
0.35
0.50
0.50
0.55
0.55
–1.2
100
1
20
–1.2
70
–600
–60
V
CC
= MAX
–100
60
V
CC
= MAX
70
75
–150
–225
87
100
110
3.4
TYP
2
MAX
UNIT
V
V
V
V
V
V
V
V
V
µA
mA
µA
mA
µA
µA
mA
mA
mA
mA
mA
A0–A7, B0 B7
A0 A7 B0–B7
V
O
OH
High-level
High level output voltage
B0–B7
B0 B7
V
CC
= MIN,
V
IL
= MAX
MAX,
V
IH
= MIN
I
O
= –3mA
3mA
OH
I
O
= –15mA
15mA
OH
I
OL
= 20mA
I
OL
= 24mA
I
OL
= MAX
I
OL
= MAX
A0–A7
A0 A7
V
OL
Low-level output voltage
B0–B7
V
OL
V
IK
I
I
I
IH
I
IL
I
IH
+I
OZH
I
IL
+I
OZL
I
OS
Low-level output voltage
Input clamp voltage
Input current at maximum
input voltage
High-level input current
Low-level input current
Off-state output current
High level voltage applied
Off-state output current
Low level voltage applied
Short-circuit
Short circuit output current
3
A0–A7
B0–B7
I
CCH
I
CC
Supply current (total)
I
CCL
I
CCZ
OE, T/R
A0–A7, B0–B7
OE, T/R only
OE, T/R only
B0–B7
V
CC
= MIN,
MIN
V
IL
= MAX,
V
IH
= MIN
V
CC
= MIN,
V
IL
= MAX,
V
IH
= MIN
V
CC
= MIN, I
I
= I
IK
V
CC
= 5.5V, V
I
= 7.0V
V
CC
= 5.5V, V
I
= 5.5V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX, V
O
= 2.7V
V
CC
= MAX, V
O
= 0.5V
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25°C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST
CONDITION
V
CC
= +5.0V
T
amb
= +25°C
C
L
= 50pF, R
L
= 500Ω
MIN
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Bn, Bn to An
Output Enable time
to High or Low level
Output Disable time
from High or Low level
Waveform 1
Waveform 2
Waveform 3
Waveform 2
Waveform 3
2.5
2.5
2.0
3.5
2.5
1.0
TYP
3.5
4.0
4.5
5.5
5.0
3.5
MAX
6.0
6.0
7.0
8.0
6.5
6.0
V
CC
= +5.0V
±
10%
T
amb
= 0°C to +70°C
C
L
= 50pF, R
L
= 500Ω
MIN
2.5
2.5
2.0
3.5
2.0
1.0
MAX
7.0
7.0
8.0
9.0
7.5
7.0
ns
ns
ns
UNIT
November 15, 1994
4
Philips Semiconductors
Product specification
Octal transceiver (3-State)
74F245
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
An, Bn
V
M
t
PLH
V
M
t
PHL
Bn, An
V
M
V
M
SF00202
Waveform 1. Propagation Delay for Non-Inverting Output
OE
V
M
t
PZH
V
M
t
PHZ
OE
V
M
t
PZL
An, Bn
V
M
V
OH
–0.3V
0V
V
M
V
OL
+0.3V
V
M
t
PLZ
An, Bn
SF00203
SF00204
Waveform 2. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Waveform 3. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
V
CC
7.0V
V
IN
PULSE
GENERATOR
R
T
D.U.T.
V
OUT
R
L
NEGATIVE
PULSE
90%
V
M
10%
t
THL (
t
f
)
C
L
R
L
t
TLH (
t
r
)
90%
POSITIVE
PULSE
10%
t
THL (
t
f
)
AMP (V)
90%
V
M
t
w
10%
0V
t
w
V
M
10%
t
TLH (
t
r
)
0V
AMP (V)
90%
Test Circuit for Open Collector Outputs
SWITCH POSITION
TEST
t
PLZ
t
PZL
All other
SWITCH
closed
closed
open
V
M
Input Pulse Definition
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
INPUT PULSE REQUIREMENTS
family
amplitude V
M
74F
3.0V
1.5V
rep. rate
1MHz
t
w
500ns
t
TLH
2.5ns
t
THL
2.5ns
SF00128
November 15, 1994
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