Philips
Semiconductors
74LVT2952
3.3V LVT octal registered transceiver
(3-State)
Product specification
Supersedes data of 1994 Sep 27
IC23 Data Handbook
1998 Feb 19
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74LVT2952
3.3V Octal registered transceiver (3-State)
2
1998 Feb 19
853-1765 18987
FEATURES
8-bit registered transceiver
Independent registers for A and B buses
Output capability: +64mA/-32mA
TTL input and output switching levels
Input and output interface capability to systems at 5V supply
Bus-hold data inputs eliminate the need for external pull-up
resistors to hold unused inputs
Live insertion/extraction permitted
No bus current loading when output is tied to 5V bus
Power-up reset
Power-up 3-State
Latch-up protection exceeds 500mA per JEDEC Std 17
ESD protection exceeds 2000V per MIL STD 883 Method 3015
and 200V per Machine Model
DESCRIPTION
The LVT2952 is a high-performance BiCMOS product designed for
V
CC
operation at 3.3V.
This device combines low static and dynamic power dissipation with
high speed and high output drive.
The 74LVT2952 device is an 8-bit registered 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
= 3.3V
3.1
3.8
ns
C
IN
Input capacitance
V
I
= 0V or 3.0V
4
pF
C
I/O
I/O pin capacitance
Outputs disabled; V
I/O
= 0V or 3.0V
8
pF
I
CCZ
Total supply current
Outputs disabled; V
CC
= 3.6V
0.13
mA
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
DWG NUMBER
24-Pin Plastic SOL
40
C to +85
C
74LVT2952 D
74LVT2952 D
SOT137-1
24-Pin Plastic SSOP Type II
40
C to +85
C
74LVT2952 DB
74LVT2952 DB
SOT340-1
24-Pin Plastic TSSOP Type I
40
C to +85
C
74LVT2952 PW
7LVT2952PW DH
SOT355-1
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
15
16
17
18
19
20
21
22
23
24
B7
B6
B5
B4
B3
B2
B1
B0
OEAB
A0
CPAB
A1
A2
A3
A4
A5
A6
A7
VCC
OEBA
11
14
CEAB
CPBA
12
13
GND
CEBA
SV00036
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)
8, 7, 6, 5,
4, 3, 2, 1
B0 B7
Data outputs/outputs (B side)
9, 15
OEAB / OEBA
Output enable inputs
12
GND
Ground (0V)
24
V
CC
Positive supply voltage
Philips Semiconductors
Product specification
74LVT2952
3.3V Octal registered transceiver (3-State)
1998 Feb 19
3
LOGIC SYMBOL
9
15
16 17 18
19
20 21 22
23
A0 A1 A2 A3 A4 A5 A6
A7
B0 B1 B2 B3 B4 B5 B6
B7
8
7
6
5
4
3
2
1
10
14
11
13
CPAB
CPBA
CEAB
CEBA
OEBA
OEAB
SV00037
LOGIC SYMBOL (IEEE/IEC)
16
17
18
19
20
21
22
23
8
7
6
5
4
3
2
1
2C6
G2
15
13
10
11
EN4 (AB)
9
1C5
14
G1
EN3 (BA)
3
6D
5D
4
1
1
SV00038
LOGIC DIAGRAM
CEAB
CE Q
CP
D
CE
Q
CP D
DETAIL A
DETAIL A X 7
CPAB
OEAB
A0
A1
A2
CPBA
OEBA
B0
A3
A4
A5
A6
A7
CEBA
B1
B2
B3
B4
B5
B6
B7
8
7
6
5
4
3
2
1
11
10
9
16
17
18
14
15
19
20
21
22
23
13
SV00039
FUNCTION TABLE for Register An or Bn
INPUTS
INTERNAL
OPERATING
An or Bn
CPXX
CEXX
INTERNAL
Q
OPERATING
MODE
X
X
H
NC
Hold data
L
H
L
L
L
H
Load data
H = High voltage level
L
= Low voltage level
= Low-to-High transition
X = Don't care
XX = AB or BA
NC= No change
FUNCTION TABLE for Output Enable
INPUTS
INTERNAL
An or Bn
OPERATING
OEXX
INTERNAL
Q
An or Bn
OUTPUTS
OPERATING
MODE
H
X
Z
Disable outputs
L
L
L
H
L
H
Enable outputs
H = High voltage level
L
= Low voltage level
X = Don't care
XX = AB or BA
Z = High impedance "off" state
Philips Semiconductors
Product specification
74LVT2952
3.3V Octal registered transceiver (3-State)
1998 Feb 19
4
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
V
CC
DC supply voltage
0.5 to +4.6
V
I
IK
DC input diode current
V
I
< 0
50
mA
V
I
DC input voltage
3
0.5 to +7.0
V
I
OK
DC output diode current
V
O
< 0
50
mA
V
OUT
DC output voltage
3
Output in Off or High state
0.5 to +7.0
V
I
O
DC output current
Output in High state
64
mA
I
OUT
DC output current
Output in Low state
128
mA
T
stg
Storage temperature range
65 to 150
C
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150
C.
3. The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
MAX
UNIT
V
CC
DC supply voltage
2.7
3.6
V
V
I
Input voltage
0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level Input voltage
0.8
V
I
OH
High-level output current
32
mA
I
O
Low-level output current
32
mA
I
OL
Low-level output current; current duty cycle
50%, f
1kHz
64
mA
t/
v
Input transition rise or fall rate; Outputs enabled
10
ns/V
T
amb
Operating free-air temperature range
40
+85
C
Philips Semiconductors
Product specification
74LVT2952
3.3V Octal registered transceiver (3-State)
1998 Feb 19
5
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
Temp = -40
C to +85
C
UNIT
MIN
TYP
1
MAX
V
IK
Input clamp voltage
V
CC
= 2.7V; I
IK
= 18mA
0.9
1.2
V
V
CC
= 2.7 to 3.6V; I
OH
= 100
A
V
CC
0.2
V
CC
0.1
V
OH
High-level output voltage
V
CC
= 2.7V; I
OH
= 8mA
2.4
2.5
V
V
CC
= 3.0V; I
OH
= 32mA
2.0
2.2
V
CC
= 2.7V; I
OL
= 100
A
0.1
0.2
V
CC
= 2.7V; I
OL
= 24mA
0.3
0.5
V
OL
Low-level output voltage
V
CC
= 3.0V; I
OL
= 16mA
0.25
0.4
V
V
CC
= 3.0V; I
OL
= 32mA
0.3
0.5
V
CC
= 3.0V; I
OL
= 64mA
0.4
0.55
V
RST
Power-up output low
voltage
5
V
CC
= 3.6V; I
O
= 1mA; V
I
= GND or V
CC
0.13
0.55
V
V
CC
= 3.6V; V
I
= V
CC
or GND
Control pins
0.1
1.0
V
CC
= 0 or 3.6V; V
I
= 5.5V
Control pins
1
10
I
I
Input leakage current
V
CC
= 3.6V; V
I
= 5.5V
1
20
A
V
CC
= 3.6V; V
I
= V
CC
I/O Data pins
4
0.1
1.0
V
CC
= 3.6V; V
I
= 0
1
-5.0
I
OFF
Output off current
V
CC
= 0V; V
I
or V
O
= 0 to 4.5V
1
100
A
6
V
CC
= 3V; V
I
= 0.8V
75
150
I
HOLD
Bus Hold current A inputs
6
V
CC
= 3V; V
I
= 2.0V
75
150
A
V
CC
= 0V to 3.6V; V
CC
= 3.6V
500
I
EX
Current into an output in the
High state when V
O
> V
CC
V
O
= 5.5V; V
CC
= 3.0V
60
125
A
I
PU/PD
Power up/down 3-State
output current
3
V
CC
1.2V; V
O
= 0.5V to V
CC
; V
I
= GND or V
CC
;
OE/OE = Don't care
1
100
A
I
CCH
V
CC
= 3.6V; Outputs High, V
I
= GND or V
CC,
I
O
=
0
0.13
0.19
I
CCL
Quiescent supply current
V
CC
= 3.6V; Outputs Low, V
I
= GND or V
CC,
I
O
=
0
3
12
mA
I
CCZ
V
CC
= 3.6V; Outputs Disabled; V
I
= GND or V
CC,
I
O
= 0
0.13
0.19
I
CC
Additional supply current
per input pin
2
V
CC
= 3V to 3.6V; One input at V
CC
0.6V,
Other inputs at V
CC
or GND
0.1
0.2
mA
NOTES:
1. All typical values are at V
CC
= 3.3V and T
amb
= 25
C.
2. This is the increase in supply current for each input at V
CC
= 0.6V.
3. This parameter is valid for any V
CC
between 0V and 1.3V with a transition time of up to 10msec. From V
CC
= 1.3V to V
CC
= 3.3V
0.3V
a transition time of 100
sec is permitted. This parameter is valid for T
amb
= 25
C only.
4. Unused pins at V
CC
or GND.
5. For valid test results, data must not be loaded into the flip-flops (or latches) after applying power.
6. This is the bus hold overdrive current required to force the input to the opposite logic state.
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