Philips Semiconductors Product specification
74ABT651Octal transceiver/register, inverting (3-State)
11995 Sep 06 853-1783 15703
FEATURES
• Independent registers for A and B buses
• The 74ABT651 is the inverting version of the 74ABT652
• Multiplexed real-time and stored data
• 3-State outputs
• Live insertion/extraction permitted.
• Power-up 3-State
• Power-up reset
• Output capability: +64mA/–32mA
• Latch-up protection exceeds 500mA per Jedec Std 17
• ESD protection exceeds 2000 V per MIL STD 883 Method 3015
and 200 V per Machine Model
DESCRIPTION
The 74ABT651 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.
The 74ABT651 transceiver/register consists of bus transceiver
circuits with 3-State outputs, D-type flip-flops, and control circuitry
arranged for multiplexed transmission of data directly from the input
bus or the internal registers. Data on the A or B bus will be clocked
into the registers as the appropriate clock pin goes High. Output
Enable (OEAB, OEBA) and Select (SAB, SBA) pins are provided for
bus management.
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74ABT651.
The select pins determine whether data is stored or transferred
through the device in real time.
The output enable pins determine the direction of the data flow.
QUICK REFERENCE DATA
SYMBOL PARAMETER
CONDITIONS
T
amb
= 25°C; GND = 0V
TYPICAL UNIT
t
PLH
t
PHL
Propagation delay
CPBA to An or CPAB to Bn
C
L
= 50pF; V
CC
= 5V
3.8
4.4
ns
C
IN
Input capacitance V
I
= 0V or V
CC
4 pF
C
I/O
I/O capacitance Outputs disabled; V
O
= 0V or V
CC
7 pF
I
CCZ
Total supply current Outputs disabled; V
CC
=5.5V 110 µA
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER
24-Pin Plastic DIP –40°C to +85°C 74ABT651 N 74ABT651 N SOT222-1
24-Pin plastic SO –40°C to +85°C 74ABT651 D 74ABT651 D SOT137-1
24-Pin Plastic SSOP Type II –40°C to +85°C 74ABT651 DB 74ABT651 DB SOT340-1
24-Pin Plastic TSSOP Type I –40°C to +85°C 74ABT651 PW 74ABT651PW DH SOT355-1
PIN CONFIGURATION
SA00094
CPAB
SAB
OEAB
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
11
12
V
CC
CPBA
SBA
OEBA
B0
B1
B2
B3
B4
B5
B6
B713
14
15
16
17
18
19
20
21
22
23
24
PIN DESCRIPTION
PIN
NUMBER
SYMBOL FUNCTION
1, 23
CPAB /
CPBA
A to B clock input / B to A clock input
2, 22
SAB /
SBA
A to B select input / B to A select input
3, 21
OEAB /
OEBA
A to B Output Enable input /
B to A Output Enable input
(active–Low)
4, 5, 6, 7, 8,
9, 10, 11
A0 – A7 Data inputs/outputs (A side)
20, 19, 18,
17, 16, 15,
14, 13
B0 – B7 Data inputs/outputs (B side)
12 GND Ground (0V)
24 V
CC
Positive supply voltage