Philips N74F1245D Datasheet
INTEGRATED CIRCUITS
74F1245
Octal transceiver (3-State)
Product specification 1995 Mar 01
IC15 Data Handbook
Philips Semiconductors
Philips Semiconductors Product specification
74F1245Octal transceiver (3-State)
FEA TURES
•Same function and pinout as 74F245
•High impedance NPN base inputs for reduced loading (70µA in
Low and High states)
•Useful in applications where light loading bus loading or direct
interface with output of a MOS microprocessor is desired
•Octal bidirectional bus interface
DESCRIPTION
The 74F1245 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 up to
15mA, producing very good capacitive drive characteristics. The
device features an Output Enable (OE
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.
) input for easy cascading and
•Glitch free during 3-State power up and power down
•3-State buffer outputs sink 64mA and source 15mA
TYPICAL
TYPE
PROPAGATION
DELA Y
74F1245 5.0ns 115mA
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
A0–A7, B0–B7 A and B port inputs 3.5/0.1 17 70µA/70µA
OE Output Enable input (active Low) 2.0/0.033 40µA/20µA
T/R Transmit/Receive input 2.0/0.033 40µA/20µA
A0–A7 A port outputs 150/40 3.0mA/24mA
B0–B7 B port outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
TYPICAL SUPPL Y
CURRENT (TOTAL)
ORDERING INFORMATION
COMMERCIAL RANGE
DESCRIPTION
20-Pin Plastic DIP N74F1245N SOT146-1
20-Pin Plastic SOL N74F1245D SOT163-1
VCC = 5V ±10%,
T
= 0°C to +70°C
amb
DRAWING
NUMBER
PIN CONFIGURATION
1
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10 11
GND
20
19
18
17
16
15
14
13
12
SF00198
V
OE
B0
B1
B2
B3
B4
B5
B6
B7
LOGIC SYMBOL
CC
19
1
V
= Pin 20
CC
GND = Pin 10
234
A0 A1 A2 A3 A4 A5
OE
T/R
B2 B3 B4 B5
B1
B0
16 15 14 13
17
18
567
89
A6 A7
B6 B7
12 11
SF00199
1995 Mar 01 853-0885 14921
2
Philips Semiconductors Product specification
I
Current applied to output in Low output state
74F1245Octal transceiver (3-State)
LOGIC SYMBOL (IEEE/IEC)
19
1
2
3
4
5
6
7
8
9
G3
3EN1 (BA)
3EN2 (AB)
∇ 1
LOGIC DIAGRAM
19
OE
1
T/R
VCC = Pin 20
GND = Pin 10
FUNCTION TABLE
INPUTS INPUTS/OUTPUTS
OE T/R An Bn
L L A = B INPUTS
L H INPUTS B = A
2 ∇
18
17
16
15
14
13
12
11
SF00649
A0 A1 A2 A3 A4 A5 A6 A7
23456789
18
B0
17
B1
16
B2
H X Z Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
15
B3
14
B4
13
B5
12
B6
B7
SF00201
11
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
OUT
T
amb
T
stg
1995 Mar 01
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
Input current –30 to +5 mA
Voltage applied to output in High output state –0.5 to +5.5 V
pp
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
PARAMETER RATING UNIT
p
p
A0–A7 48 mA
B0–B7 128 mA
3
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