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PDF 74LPT244 Data sheet ( Hoja de datos )
| Número de pieza | 74LPT244 | |
| Descripción | PI74LPT244 | |
| Fabricantes | Pericom Semiconductor | |
| Logotipo |  |
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Features
• Compatible with LCX™ and LVT™ families of products
• Supports 5V Tolerant Mixed Signal Mode Operation
– Input can be 3V or 5V
– Output can be 3V or connected to 5V bus
www.DataS•heAet4dUva.cnocmed Low Power CMOS Operation
• Excellent output drive capability:
Balanced drives (24mA sink and source)
• Low ground bounce outputs
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages (Pb-free & Green available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 150-mil wide plastic QSOP (Q)
– 20-pin 300-mil wide plastic SOIC (S)
– 20-pin 209-mil wide plastic SSOP (H)
Block Diagram
PI74LPT244
Fast CMOS 3.3V 8-Bit
Buffer/Line Driver
Description
Pericom Semiconductor’s PI74LPT244 is an 8-bit buffer/line
driver designed for driving high capacitive memory loads. With
its balanced-drive characteristics, this high-speed, low power device
provides lower ground bounce, transmission line matching of signals,
fewer line reflections and lower EMI and RFI effects. This makes
it ideal for driving on-board buses and transmission lines.
The PI74LPT244 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.
Pin Configuration
OEA
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
GND
1 20
2 19
3 18
4 20-PIN 17
5 L20 16
6
7
Q20
S20
15
14
8 13
9 12
10 11
VCC
OEB
OA0
DB0
OA1
DB1
OA2
DB2
OA3
DB3
06-0181
1
PS2058F 06/05/06
1 page  
PI74LPT244
3.3V 8-Bit Buffer /Line Driver
Switching Characteristics over Operating Range(1)
LPT244
LPT244A
LPT244C
Parameters
Description
Conditions
Com.
Min.(2) Max
Com.
Min.(2) Max.
Com.
Units
Min.(2) Max.
tPLH Propagation Delay
tPHL
DXX to OXX
1.5 6.5 1.5 4.8 1.5 4.1
tPZH
tPZL
www.DataShtPeHetZ4U.com
tPLZ
Output Enable Time
OEx to Oxx
Output Disable Time(3)
OEx to Oxx
CL = 50pF
RL = 500Ω
1.5
1.5
8.0
7.0
1.5
1.5
6.2 1.5 5.8
ns
5.6 1.5 5.2
tSK(O)
Output Skew(4)
0.5 0.5 0.5
Notes:
1. Propagation Delays and Enable/Disable times are with Vcc = 3.3V ±0.3V, normal range. For Vcc = 2.7V, extended range, all Propagation Delays
and Enable/Disable times should be degraded by 20%.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Packaging Mechanical: 20-pin QSOP (Q)
20
1
.337 8.56
.344 8.74
.150 3.81
.157 3.99
Guage Plane
.010
0.254
Detail A
.008
0.20
MIN.
.008
.013
0.20
0.33
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.058 REF
1.47
.053 1.35
.069 1.75
SEATING
PLANE
.025
BSC
0.635
.008 0.203
.012 0.305
.004 0.101
.010 0.254
.015 x 45˚
0.38
Detail A
.016 0.41
.050 1.27
.228
.244
5.79
6.19
.007 0.178
.010 0.254
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
06-0181
5
PS2058F 06/05/06
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74LPT244.PDF ] | |
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