Philips 74als645a DATASHEETS
INTEGRATED CIRCUITS
74ALS645A/74ALS645A–1
Octal transceiver (3–State)
Product specification
IC05 Data Handbook
1991 Jun 03
Philips Semiconductors Product specification
74ALS645A/74ALS645A-1Octal transceiver (3-State)
FEA TURES
PIN CONFIGURATION
•Octal bidirectional bus interface
1
•3-State buffer outputs sink 24mA and source 15mA
•Outputs are placed in high impedance state during power-off
conditions
•The -1 version sinks 48mA I
DESCRIPTION
The 74ALS645A is an octal transceiver featuring non-inverting
3-State bus compatible outputs in both transmit and receive
directions. The device features an output enable (OE) input for easy
cascading and transmit/receive (R/T
within the +5% VCC range
OL
) input for direction control.
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10 11
GND
The 74ALS645A-1 is the same as the 74ALS645A except that both
ports sink 48mA within the ±5% V
TYPE
PROPAGATION
74ALS645A 7.0ns 34mA
74ALS645A-1 7.0ns 34mA
CC
TYPICAL
DELA Y
range.
TYPICAL
SUPPLY CURRENT
(TOTAL)
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION
20-pin plastic DIP
20-pin plastic SOL
COMMERCIAL RANGE
V
CC
= 0°C to +70°C
T
amb
74ALS645AN,
74ALS645A-1N
74ALS645AD,
744ALS645A-1D
= 5V ±10%,
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
A0 – A7, B0 – B7 Data inputs 1.0/1.0 20µA/0.1mA
OE Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA
T/R Transmit/receive input 1.0/1.0 20µA/0.1mA
A0 – A7 A port outputs 750/240 15mA/24mA
B0 – B7 B port outputs 750/240 15mA/24mA
A0 – A7 A port outputs (-1 version) 750/480 15mA/48mA
B0 – B7 B port outputs (-1 version) 750/480 15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
74ALS (U.L.)
HIGH/LOW
V
20
CC
19
OE
18
B0
17
B1
16
B2
15
B3
14
B4
13
B5
12
B6
B7
LOAD VALUE
HIGH/LOW
SF00198
DRAWING
NUMBER
SOT146-1
SOT163-1
LOGIC SYMBOL
234
A0 A1 A2 A3 A4 A5
19
1
V
= Pin 20
CC
GND = Pin 10
OE
T/R
B1
B0
17
18
1991 Jun 03 853–0597 02709
567
B2 B3 B4 B5
16 15 14 13
89
A6 A7
B6 B7
12 11
SF00199
IEC/IEEE SYMBOL
2
19
1
2
3
4
5
6
7
8
9
G3
3EN1 [BA]
3EN2 [AB]
∇ 1
2 ∇
18
17
16
15
14
13
12
11
SC00097
Philips Semiconductors Product specification
OUTPUTS
I
Current applied to output in Low output state
SYMBOL
UNIT
IOLLow-level output current
74ALS645A/74ALS645A-1Octal transceiver (3-State)
LOGIC DIAGRAM
A0 A1 A2 A3 A4 A5 A6 A7
23456789
19
OE
1
T/R
VCC = Pin 20
GND = Pin 10
FUNCTION TABLE
INPUTS
OE T/R
L L Bus B data to Bus A
L H Bus A data to Bus B
H X Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
18
B0
17
B1
16
B2
15
B3
14
B4
13
B5
12
B6
11
B7
SF00201
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit 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
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 V
pp
p
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
PARAMETER RATING UNIT
p
All versions 48 mA
-1 version 96 mA
RECOMMENDED OPERATING CONDITIONS
PARAMETER
V
CC
V
V
I
IK
I
OH
T
amb
NOTES:
1. The 48mA limit applies only under the condition of V
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level input voltage 0.8 V
IL
Input clamp current –18 mA
High-level output current –15 mA
p
All versions 24 mA
-1 version 48
Operating free-air temperature range
= 5.0V ± 5%.
CC
CC
LIMITS
MIN NOM MAX
1
0 +70 °C
V
mA
1991 Jun 03
3
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