21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16244
Product Features
•
PI74ALVCHT16244 is designed for low voltage operation
•
V
CC
= 2.3V to 3.6V
•
5V I/O Tolerant
•
Hysteresis on all inputs
•
Typical V
OLP
(Output Ground Bounce)
< 0.8V at V
CC
= 3.3V, T
A
= 25°C
•
Typical V
OHV
(Output V
OH
Undershoot)
< 2.0V at V
CC
= 3.3V, T
A
= 25°C
•
Bus Hold retains last active bus state during 3-state
eliminates the need for external pullup resistors
•
Industrial operation at 40°C to +85°C
•
Packages available:
48-pin 240 mil wide plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
Product Description
16-Bit Buffer/Driver
with 3-State Outputs
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced in the Companys advanced 0.5 micron CMOS technology,
achieving industry leading speed.
The PI74ALVCHT16244 is a 16-bit buffer/driver designed for 2.3V
to 3.6V V
CC
operation.
The buffer/driver is designed specifically to improve both the
performance and density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and transmitters.
The device can be used as four 4-bit buffers, two 8-bit buffers, or one
16-bit buffer. It provides true outputs and symmetrical active-low
output-enable (OE) inputs.
To ensure the high-impedance state during power up or power down,
OE should be tied to V
CC
through a pullup resistor; the minimum
value of the resistor is determined by the current-sinking capability
of the driver.
The PI74ALVCHT16244 has Bus Hold which retains the data
inputs last state whenever the data input goes to high-impedance
preventing floating inputs and eliminating the need for pullup/
down resistors.
The PI74ALVCHT16244 can be driven from either 3.3V or 5.0V
devices allowing this device to be used as a translator in a mixed
3.3/5.0V system.
Logic Block Diagram
1
OE
1
3
OE
25
1
A
1
47
2
1
Y
1
3
A
1
36
13
3
Y
1
1
A
2
46
3
1
Y
2
3
A
2
35
14
3
Y
2
1
A
3
44
5
1
Y
3
3
A
3
33
16
3
Y
3
1
A
4
43
6
1
Y
4
3
A
4
32
17
3
Y
4
2
OE
48
4
OE
24
2
A
1
41
8
2
Y
1
4
A
1
30
19
4
Y
1
2
A
2
40
9
29
2
Y
2
4
A
2
20
4
Y
2
2
A
3
38
11
2
Y
3
4
A
3
27
22
4
Y
3
2
A
4
37
12
26
2
Y
4
4
A
4
23
4
Y
4
1
PS8309
07/30/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16244
16-Bit Buffer Driver with 3-State O
utputs
Product Pin Description
Pin Name
nOE
nAx
nYx
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
Inputs
3-State Outputs
Ground
Power
Truth Table
(1)
Inputs
nOE
L
L
H
nA
X
H
L
X
Outputs
nYx
H
L
Z
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don’t Care or Irrelevant
Z = High Impedance
Product Pin Configuration
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature .............................................. 65°C to +150°C
Ambient Temperature with Power Applied ........... 40°C to +85°C
Input Voltage Range, V
IN
........................................... 0.5V to +6.0V
Output Voltage Range, V
OUT
.................................... 0.5V to +6.0V
DC Input Voltage ....................................................... 0.5V to +6.0V
DC Output Current ................................................................. 50 mA
Power Dissipation ..................................................................... 1.0W
1OE
1Y1
1Y2
GND
1Y3
1Y4
VCC
2Y1
2Y2
GND
2Y3
2Y4
3Y1
3Y2
GND
3Y3
3Y4
VCC
4Y1
4Y2
GND
4Y3
4Y4
4OE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
2OE
1A1
1A2
GND
1A3
1A4
VCC
2A1
2A2
GND
2A3
2A4
3A1
3A2
GND
3A3
3A4
VCC
4A1
4A2
GND
4A3
4A4
3OE
48-PIN
V48
A48
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Note:
Stresses greater than those listed under MAXIMUM RATINGS
may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2
PS8309
07/30/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16244
16-Bit Buffer Driver with 3-State O
utputs
Typ.
(2)
M ax.
3.6
5.5
5.5
0.7
0.8
Units
V
V
V
V
V
V
V
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.3V ± 10%)
Parame te rs
V
CC
V
IH
(3)
V
IL
(3)
V
IN
(3)
V
OUT
(3)
De s cription
Supply Voltage
Input HIGH Voltage
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
0
0
I
OH
= - 100
m
A, V
CC
= Min. to Max.
V
IH
= 1.7V, I
OH
= - 6mA, V
CC
= 2.3V
V
OH
Output
HIGH
Voltage
V
IH
= 1.7V, I
OH
= - 12mA, V
CC
= 2.3V
V
IH
= 2.0V, I
OH
= - 12mA, V
CC
= 2.7V
V
IH
= 2.0V, I
OH
= - 12mA, V
CC
= 3.0V
V
IH
= 2.0V, I
OH
= - 24mA, V
CC
= 3.0V
I
OL
= 100
m
A, V
IL
= Min. to Max.
Output
LOW
Voltage
V
IL
= 0.7V, I
OL
= 6mA, V
CC
= 2.3V
V
IL
= 0.7V, I
OL
= 12mA, V
CC
= 2.3V
V
IL
= 0.8V, I
OL
= 12mA, V
CC
= 2.7V
V
IL
= 0.8V, I
OL
= 24mA, V
CC
= 3.0V
I
OH
(3)
Output
HIGH
Current
Output
LOW
Current
Input Current
Input
Hold
Current
Output Current
(3- State Outputs)
Supply Current
Supply Current per
Input @ TTL HIGH
Control Inputs
Data Inputs
Outputs
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
IN
= V
CC
or GND, V
CC
= 3.6V
V
IN
= 0.8V, V
CC
= 3.0V
V
IN
= 2.0V, V
CC
= 3.0V
V
IN
= 0 to 3.6V, V
CC
= 3.6V
V
OUT
= 5.5V or GND, V
CC
= 3.6V
V
CC
= 3.6V, I
OUT
= 0
m
A,
V
IN
= GND or V
CC
V
CC
= 3.0V to 3.6V
One Input at V
CC
- 0.6V
Other Inputs at V
CC
or GND
V
IN
= V
CC
or GND, V
CC
= 3.3V
V
O
= V
CC
or GND, V
CC
= 3.3V
3
6
7
75
- 75
±500
±10
40
750
V
CC
- 0.2
2.0
1.7
2.2
2.4
2.0
0.2
0.4
0.7
0.4
0.55
- 12
- 12
- 24
12
12
24
±5
Te s t Conditions
(1)
M in.
2.3
1.7
2.0
Input LOW Voltage
Input Voltage
Output Voltage
5.5
5.5
V
V
OL
V
mA
I
OL
(3)
mA
I
IN
I
IN
(
HOLD
)
mA
I
OZ
Icc
D
Icc
mA
mA
mA
C
I
C
O
pF
pF
device type.
Notes:
1. For Max. or Min.conditions, use appropriate value specified under Electrical Characteristics for the applicable
2. Typical values are at Vcc = 3.3V, +25°C ambient and maximum loading.
3. Unused Control Inputs must be held HIGH or LOW to prevent them from floating.
3
PS8309
07/30/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16244
16-Bit Buffer Driver with 3-State O
utputs
Switching Characteristics over Operating Range
(1)
From
To
(INPUT) (OUTPUT)
A
Y
OE
Y
OE
Y
D e s cription
Input Transition Rise or
Fall
V
CC
= 2.5 V ± 0.2 V
M in.
(2)
1.0
1.0
1.0
0
M ax.
5.0
6.8
6.0
10
V
CC
= 2.7 V
M in.
(2)
M ax.
4.0
6.0
5.2
10
V
CC
= 3.3 V ± 0.3 V
M in.
(2)
1.0
1.0
1.0
0
M ax.
3.6
5.0
5.0
10
Units
Parame te rs
t
PD
t
EN
t
DIS
D
t/
Dv
(3)
ns
0
ns/V
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Recommended operating condition.
Operating Characteristics, T
A
= 25ºC
Parame te rs
C
PD
Power Dissipation
Capacitance
Outputs Enabled
Outputs Disabled
Te s t
Conditions
C
L
= 50pF
f = 10 MHz
V
CC
= 2.5V ± 0.2V V
CC
= 3.3V ± 0.3V
Typical
16
4
Typical
19
5
pF
Units
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS8309
07/30/98
京公网安备 11010802033920号
EEWORLD
