Philips Semiconductors
Product specification
Octal transceiver/register, inverting (3-State)
74ABT651
FEATURES
• Independent registers for A and B buses
DESCRIPTION
The 74ABT651 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.
• The 74ABT651 is the inverting version of the 74ABT652
• Multiplexed real-time and stored data
• 3-State outputs
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.
• Live insertion/extraction permitted.
• Power-up 3-State
• Power-up reset
• Output capability: +64mA/–32mA
• Latch-up protection exceeds 500mA per Jedec Std 17
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74ABT651.
• ESD protection exceeds 2000 V per MIL STD 883 Method 3015
The select pins determine whether data is stored or transferred
through the device in real time.
and 200 V per Machine Model
The output enable pins determine the direction of the data flow.
QUICK REFERENCE DATA
CONDITIONS
= 25°C; GND = 0V
SYMBOL
PARAMETER
TYPICAL
UNIT
T
amb
t
t
Propagation delay
3.8
4.4
PLH
PHL
C = 50pF; V = 5V
ns
L
CC
CPBA to An or CPAB to Bn
Input capacitance
C
V = 0V or V
I CC
4
7
pF
pF
µA
IN
C
I/O capacitance
Outputs disabled; V = 0V or V
O CC
I/O
I
Total supply current
Outputs disabled; V =5.5V
110
CCZ
CC
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
NORTH AMERICA
74ABT651 N
DWG NUMBER
SOT222-1
24-Pin Plastic DIP
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
74ABT651 N
74ABT651 D
74ABT651 DB
74ABT651 PW
24-Pin plastic SO
74ABT651 D
SOT137-1
24-Pin Plastic SSOP Type II
24-Pin Plastic TSSOP Type I
74ABT651 DB
74ABT651PW DH
SOT340-1
SOT355-1
PIN CONFIGURATION
PIN DESCRIPTION
PIN
SYMBOL
NUMBER
FUNCTION
CPAB
SAB
OEAB
A0
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
CPAB /
1, 23
CPBA
SBA
OEBA
B0
A to B clock input / B to A clock input
A to B select input / B to A select input
CPBA
SAB /
2, 22
SBA
A1
A to B Output Enable input /
B to A Output Enable input
(active–Low)
OEAB /
3, 21
A2
B1
OEBA
A3
B2
4, 5, 6, 7, 8,
9, 10, 11
A0 – A7 Data inputs/outputs (A side)
A4
B3
A5
B4
20, 19, 18,
17, 16, 15,
14, 13
B0 – B7 Data inputs/outputs (B side)
A6 10
A7 11
B5
B6
12
24
GND
Ground (0V)
GND 12
B7
V
CC
Positive supply voltage
SA00094
1
1995 Sep 06
853-1783 15703