Philips Semiconductors Product specification
74ABT2953Octal registered transceiver, inverting (3-State)
11995 Sep 06 853-1555 15702
FEATURES
• 8-bit registered transceiver
• Independent registers for A and B buses
• Output capability: +64mA/–32mA
• Latch-up protection exceeds 500mA per Jedec Std 17
• ESD protection exceeds 2000V per MIL STD 883 Method 3015
and 200V per Machine Model
• Live insertion/extraction permitted
• Power-up 3-State
• Power-up reset
DESCRIPTION
The 74ABT2953 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.
The 74ABT2953 device is an 8-bit registered inverting transceiver.
Two 8-bit back-to-back registers store data flowing in both directions
between two bidirectional buses. Data applied to the inputs is
entered and stored on the rising edge of the Clock (CPXX) provided
that the Clock Enable (CEXX) is Low. The data is then present at
the 3-State output buffers, but is only accessible when the Output
Enable (OEXX) is Low. Data flow from A inputs to B outputs is the
same as for B inputs to A outputs.
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 5.0 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 500 nA
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER
24-Pin Plastic DIP –40°C to +85°C 74ABT9253 N 74ABT2953 N SOT222-1
24-Pin plastic SO –40°C to +85°C 74ABT2953 D 74ABT2953 D SOT137-1
24-Pin Plastic SSOP Type II –40°C to +85°C 74ABT2953 DB 74ABT2953 DB SOT340-1
24-Pin Plastic TSSOP Type I –40°C to +85°C 74ABT2953 PW 74ABT2953PW DH SOT355-1
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10 15
16
17
18
19
20
21
22
23
24B7
B6
B5
B4
B3
B2
B1
B0
OEAB A0
CPAB
A1
A2
A3
A4
A5
A6
A7
V
CC
OEBA
11 14CEAB CPBA
12 13GND CEBA
TOP VIEW
SA00305
PIN DESCRIPTION
PIN NUMBER SYMBOL NAME AND FUNCTION
10, 14
CPAB /
CPBA
Clock input A to B / Clock input
B to A
11, 13
CEAB /
CEBA
Clock enable input A to B / Clock
enable input B to A
16, 17, 18, 19,
20, 21, 22, 23
A0 – A7 Data inputs/outputs (A side)
1, 2, 3, 4, 5, 6,
7, 8
B0 – B7 Data outputs/outputs (B side)
9, 15
OEAB /
OEBA
Output enable inputs
12 GND Ground (0V)
24 V
CC
Positive supply voltage