INTEGRATED CIRCUITS
74LVT2952
3.3V LVT octal registered transceiver
(3-State)
Product specification
Supersedes data of 1994 Sep 27
IC23 Data Handbook
1998 Feb 19
Philips
Semiconductors
Philips Semiconductors
Product specification
3.3V Octal registered transceiver (3-State)
74LVT2952
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
•
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
resistors to hold unused inputs
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
t
PLH
t
PHL
C
IN
C
I/O
I
CCZ
PARAMETER
Propagation delay
CPBA to An or
CPAB to Bn
Input capacitance
I/O pin capacitance
Total supply current
CONDITIONS
T
amb
= 25°C; GND = 0V
C
L
= 50pF; V
CC
= 3.3V
V
I
= 0V or 3.0V
Outputs disabled; V
I/O
= 0V or 3.0V
Outputs disabled; V
CC
= 3.6V
TYPICAL
3.1
3.8
4
8
0.13
UNIT
ns
pF
pF
mA
ORDERING INFORMATION
PACKAGES
24-Pin Plastic SOL
24-Pin Plastic SSOP Type II
24-Pin Plastic TSSOP Type I
TEMPERATURE RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
OUTSIDE NORTH AMERICA
74LVT2952 D
74LVT2952 DB
74LVT2952 PW
NORTH AMERICA
74LVT2952 D
74LVT2952 DB
7LVT2952PW DH
DWG NUMBER
SOT137-1
SOT340-1
SOT355-1
PIN CONFIGURATION
B7
B6
B5
B4
B3
B2
B1
B0
OEAB
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
A7
A6
A5
A4
A3
A2
A1
A0
OEBA
CPBA
CEBA
PIN DESCRIPTION
PIN
NUMBER
10, 14
11, 13
16, 17, 18,
19, 20, 21,
22, 23
8, 7, 6, 5,
4, 3, 2, 1
9, 15
12
24
SYMBOL
CPAB / CPBA
CEAB / CEBA
NAME AND FUNCTION
Clock input A to B /
Clock input B to A
Clock enable input A to B /
Clock enable input B to A
Data inputs/outputs (A side)
A0 – A7
B0 – B7
OEAB / OEBA
GND
V
CC
Data outputs/outputs (B side)
Output enable inputs
Ground (0V)
Positive supply voltage
CPAB 10
CEAB 11
GND 12
SV00036
1998 Feb 19
2
853-1765 18987
Philips Semiconductors
Product specification
3.3V Octal registered transceiver (3-State)
74LVT2952
LOGIC SYMBOL
LOGIC SYMBOL (IEEE/IEC)
15
EN3 (BA)
13
14
G1
1C5
EN4 (AB)
G2
2C6
3
6D
1
1
5D
4
7
6
5
4
3
2
1
8
16 17 18 19
20 21 22
23
9
11
10
A0 A1 A2 A3 A4 A5 A6 A7
10
11
14
13
CPAB
CEAB
CPBA
CEBA
B0 B1 B2 B3 B4 B5 B6 B7
OEBA
OEAB
15
9
16
17
18
19
20
8
7
6
5
4
3
2
1
21
22
SV00037
23
SV00038
LOGIC DIAGRAM
CEAB11
CPAB10
OEAB 9
DETAIL A
A0 16
CE Q
D CP
Q CE
CP D
8
B0
A1
A2
A3
A4
A5
A6
A7
CEBA
17
18
19
20
21
22
23
13
DETAIL A X 7
7
6
5
4
3
2
1
B1
B2
B3
B4
B5
B6
B7
CPBA
OEBA
14
15
SV00039
FUNCTION TABLE for Register An or Bn
INPUTS
An or Bn
X
L
H
CPXX
X
↑
↑
CEXX
H
L
L
INTERNAL
Q
NC
L
H
OPERATING
MODE
Hold data
Load data
FUNCTION TABLE for Output Enable
INPUTS
OEXX
H
L
L
INTERNAL
Q
X
L
H
An or Bn
OUTPUTS
Z
L
H
OPERATING
MODE
Disable outputs
Enable outputs
H = High voltage level
L = Low voltage level
↑
= Low-to-High transition
X = Don’t care
XX = AB or BA
NC= No change
H = High voltage level
L = Low voltage level
X = Don’t care
XX = AB or BA
Z = High impedance ”off” state
1998 Feb 19
3
Philips Semiconductors
Product specification
3.3V Octal registered transceiver (3-State)
74LVT2952
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
V
CC
I
IK
V
I
I
OK
V
OUT
I
O
OUT
T
stg
PARAMETER
DC supply voltage
DC input diode current
DC input voltage
3
DC output diode current
DC output voltage
3
DC output current
Output in Low state
Storage temperature range
128
–65 to 150
°C
V
O
< 0
Output in Off or High state
Output in High state
V
I
< 0
CONDITIONS
RATING
–0.5 to +4.6
–50
–0.5 to +7.0
–50
–0.5 to +7.0
–64
mA
UNIT
V
mA
V
mA
V
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
LIMITS
SYMBOL
V
CC
V
I
V
IH
V
IL
I
OH
I
O
OL
∆t/∆v
T
amb
DC supply voltage
Input voltage
High-level input voltage
Low-level Input voltage
High-level output current
Low-level output current
Low-level output current; current duty cycle
≤
50%, f
≥
1kHz
Input transition rise or fall rate; Outputs enabled
Operating free-air temperature range
–40
PARAMETER
MIN
2.7
0
2.0
0.8
–32
32
mA
64
10
+85
ns/V
°C
MAX
3.6
5.5
V
V
V
V
mA
UNIT
1998 Feb 19
4
Philips Semiconductors
Product specification
3.3V Octal registered transceiver (3-State)
74LVT2952
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
Temp = -40°C to +85°C
MIN
V
IK
Input clamp voltage
V
CC
= 2.7V; I
IK
= –18mA
V
CC
= 2.7 to 3.6V; I
OH
= –100µA
V
OH
High-level output voltage
V
CC
= 2.7V; I
OH
= –8mA
V
CC
= 3.0V; I
OH
= –32mA
V
CC
= 2.7V; I
OL
= 100µA
V
CC
= 2.7V; I
OL
= 24mA
V
OL
Low-level output voltage
V
CC
= 3.0V; I
OL
= 16mA
V
CC
= 3.0V; I
OL
= 32mA
V
CC
= 3.0V; I
OL
= 64mA
V
RST
Power-up output low
voltage
5
V
CC
= 3.6V; I
O
= 1mA; V
I
= GND or V
CC
V
CC
= 3.6V; V
I
= V
CC
or GND
V
CC
= 0 or 3.6V; V
I
= 5.5V
I
I
Input leakage current
V
CC
= 3.6V; V
I
= 5.5V
V
CC
= 3.6V; V
I
= V
CC
V
CC
= 3.6V; V
I
= 0
I
OFF
I
HOLD
Output off current
Bus Hold current A
inputs
6
V
CC
= 0V; V
I
or V
O
= 0 to 4.5V
V
CC
= 3V; V
I
= 0.8V
V
CC
= 3V; V
I
= 2.0V
V
CC
= 0V to 3.6V; V
CC
= 3.6V
I
EX
I
PU/PD
I
CCH
I
CCL
I
CCZ
∆I
CC
Additional supply current
per input pin
2
Quiescent supply current
Current into an output in the
High state when V
O
> V
CC
Power up/down 3-State
output current
3
V
O
= 5.5V; V
CC
= 3.0V
V
CC
≤
1.2V; V
O
= 0.5V to V
CC
; V
I
= GND or V
CC
;
OE/OE = Don’t care
V
CC
= 3.6V; Outputs High, V
I
= GND or V
CC,
I
O
= 0
V
CC
= 3.6V; Outputs Low, V
I
= GND or V
CC,
I
O
= 0
V
CC
= 3.6V; Outputs Disabled; V
I
= GND or V
CC,
I
O
= 0
V
CC
= 3V to 3.6V; One input at V
CC
– 0.6V,
Other inputs at V
CC
or GND
75
–75
±500
60
±1
0.13
3
0.13
0.1
125
±100
0.19
12
0.19
0.2
mA
mA
µA
µA
I/O Data pins
4
Control pins
V
CC
–0.2
2.4
2.0
TYP
1
–0.9
V
CC
–0.1
2.5
2.2
0.1
0.3
0.25
0.3
0.4
0.13
±0.1
1
1
0.1
–1
1
150
–150
µA
0.2
0.5
0.4
0.5
0.55
0.55
±1.0
10
20
1.0
-5.0
±100
µA
µA
V
V
V
MAX
–1.2
V
UNIT
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 100µsec 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.
1998 Feb 19
5
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