Philips Semiconductors
Product specification
Transceivers
74ALS620A/74ALS620A-1
74ALS623A/74ALS623A-1
74ALS620A/74ALS620A-1 Octal bus transceiver, inverting (3-State)
74ALS623A/74ALS623A-1 Octal bus transceiver, non-inverting (3-State)
FEATURES
•
Octal bidirectional bus interface
•
3-State buffer outputs sink 24mA and source 15mA
•
The -1 version sinks 48mA I
OL
within the +5% V
CC
range
TYPE
74ALS620A/620A-1
74ALS623A/623A-1
TYPICAL
PROPAGATION
DELAY
4.0ns
4.0ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
33mA
38mA
DESCRIPTION
The 74ALS620A and 74ALS623A are octal transceiver featuring
3-State bus compatible outputs in both transmit and receive
directions. The 74ALS620A is an inverting version of the
74ALS623A. The outputs are capable of sinking 24mA and sourcing
up to 15mA, providing very good capacitive drive characteristics.
The outputs for the 74ALS620A-1 and 74ALS623A are capable of
sinking up to 48mA when within the
±5%
V
CC
range.
These octal bus transceivers are designed for asynchronous
two-way communication between data buses. The control function
implementation allows for maximum flexibility in timing.
These devices allow data transmission from the A bus to the B bus
or from B bus to A bus, depending on the logic levels at the enable
inputs (OEBA and OEAB). The enable inputs can be used to disable
the device so that the buses are effectively isolated. The
dual-enable configuration gives the 74ALS620A and 74ALS623A the
capability to store data by the simultaneous enabling of OEBA and
OEAB. Each output reinforces its input in this transceiver
configuration. Thus when both control inputs are enabled and all
other data sources to the two sets of the bus lines are at high
impedance, both sets of the bus lines (16 in all) will remain at their
last states.
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
74ALS620AN, 74ALS620A-1N
74ALS623AN, 74ALS623A-1N
74ALS620AD, 74ALS620A-1D
74ALS623AD, 74ALS623A-1D
DRAWING
NUMBER
20-pin plastic DIP
20-pin plastic SOL
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
A0 – A7, B0 – B7
OEBA, OEAB
A0 – A7, B0 – B7
A0 – A7, B0 – B7
Data inputs
Output Enable inputs
Data outputs
Data outputs (-1 version)
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
750/240
750/480
LOAD VALUE
HIGH/LOW
20µA/0.1mA
20µA/0.1mA
15mA/24mA
15mA/48mA
NOTE:
One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
PIN CONFIGURATION – 74ALS620A/74ALS620A-1
OEAB
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20 V
CC
19 OEBA
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
PIN CONFIGURATION – 74ALS623A/74ALS623A-1
OEAB
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20 V
CC
19 OEBA
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
GND 10
GND 10
SC00101
SC00102
1991 Feb 08
2
853–0020 01670
Philips Semiconductors
Product specification
Transceivers
74ALS620A/74ALS620A-1
74ALS623A/74ALS623A-1
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
I
O
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
All versions
Current applied to output in Low output state
-1 version
Operating free-air temperature range
Storage temperature range
96
0 to +70
–65 to +150
mA
°C
°C
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to V
CC
48
UNIT
V
V
mA
V
mA
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
OH
I
O
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
All versions
Low-level
Low level output current
-1 version
Operating free-air temperature range
0
PARAMETER
MIN
4.5
2.0
0.8
–18
–15
24
48
1
+70
LIMITS
UNIT
NOM
5.0
MAX
5.5
V
V
V
mA
mA
mA
mA
°C
NOTE:
1. The 48mA limit applies only under the condition of V
CC
= 5.0V
±5%.
1991 Feb 08
5
京公网安备 11010802033920号
EEWORLD
