Document
INTEGRATED CIRCUITS
74ALS620A/74ALS620A–1 74ALS623A/74ALS623A–1 Transceivers
Product specification IC05 Data Handbook 1991 Feb 08
Philips Semiconductors
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 IOL within the +5% VCC 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% VCC 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 VCC = 5V ±10%, Tamb = 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 VCC 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 VCC 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
LOGIC SYMBOL – 74ALS620A/74ALS620A-1
2 3 4 5 6 7 8 9
LOGIC SYMBOL – 74ALS623A/74ALS623A-1
2 3 4 5 6 7 8 9
A0 1 19 OEAB OEBA B0
A1
A2
A3
A4
A5
A6
A7 1 19
A0 OEAB OEBA B0
A1
A2
A3
A4
A5
A6
A7
B1
B2
B3
B4
B5
B6
B7
B1
B2
B3
B4
B5
B6
B7
18 VCC = Pin 20 GND = Pin 10
17
16
15
14
13
12
11
18
17
16
15
14
13
12
11
SC00103
VCC = Pin 20 GND = Pin 10
SC00104
IEC/IEEE SYMBOL – 74ALS620A/74ALS620A-1
1 19
IEC/IEEE SYMBOL – 74ALS623A/74ALS623A-1
1 19
EN1 EN2
EN1 EN2
2
1 2
18
2
1 2
18
3 4 5 6 7 8 9
17 16 15 14 13 12 11
3 4 5 6 7 8 9
17 16 15 14 13 12 11
SC00105
SC00106
1991 Feb 08
3
Philips Semiconductors
Product specification
Transceivers
74ALS620A/74ALS620A-1 74ALS623A/74ALS623A-1
LOGIC DIAGRAM – 74ALS620A/74ALS620A-1
OEBA OEAB 19 1
LOGIC DIAGRAM – 74ALS623A/74ALS623A-1
OEBA OEAB 19 1
A0
2
18
B0
A0
2
18
B0
A1
3
17
B1
A1
3
17
B1
A2
4
16
B2
A2
4
16
B2
A3
5
15
B3
A3
5
15
B3
A4
6
14
B4
A4
6
14
B4
A5
7
13
B5
A5
7
13
B5
A6
8
12
B6
A6
8
12
B6
A7 VCC = Pin 20 GND = Pin 10
9
11
B7 VCC = Pin 20 GND = Pin 10
A7
9
11
B7
SC00107
SC00108
FUNCTION TABLE
INPUTS OEBA L L H L L H L X Z = = = = High voltage level Low voltage level Don’t care High impedance “off” state OEAB L H L H H 74ALS620A B data to A Bus A data to B Bus Z B data to A Bus A data to B Bus OPERATING MODES 74ALS623A B data to A Bus A data to B Bus Z B data to A Bus A data to B Bus
1991 Feb 08
4
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 VCC VIN IIN VOUT IOUT O Tamb Tstg Supply voltage Input voltage Input current Voltage applied.