CALIFORNIA MICRO DEVICES
PAC1284
Applications
ECP/EPP Parallel Port termination
EMI/RFI filter
Notebook and Desktop computers
Engineering Workstations and Servers
P/ACTIVE IEEE 1284 ECP/EPP TERMINATION NETWORK
Features
Stable resistor-capacitor network
9 terminating lines/package
Saves board space, reduces assembly cost,
simplifies routing
ESD protected
Miniature QSOP package
Product Description
Note: CAMDs P/Active 1284 Parallel Port Termination Network is an upgraded version of the original PRC1284 or IPEC1284 which
provides ESD protection, minimized lead inductance and parasitic capacitive effects, and improved crosstalk and filter performance
characteristics at high data transmission rates. The PAC1284 is recommended for all new designs.
Advanced, enhanced high-speed parallel ports, conforming to the IEEE 1284 standard, are used to provide communications
with external devices such as tape back-up drives, ZIP drives, printers, parallel port SCSI adapters, external LAN adapters,
scanners, video capture, and other PC peripherals. These advanced ports also support bi-directional transfers to 2MB/sec. To
effectively support these higher transfer data rates, the IEEE 1284 standard recommends a combined termination, pull-up filter
network between the driver/receiver and the cable at both ends of the parallel port interface. In addition, government EMC
compatibility requirements impose strict filtering on the parallel port. CAMDs P/Active 1284 Parallel Port Termination Network
addresses all of these requirements by providing a nine line, IEEE 1284 compliant network, in a thin film integrated circuit. Two
of these devices replace up to 54 discrete components and provide a complete parallel port termination solution for space-
critical applications.
CAMDs P/Active technology provides high reliability and low cost through manufacturing efficiency. The P/Active 1284 includes
pull-up, series termination, an EMI filter capacitor, and ESD protection for the capacitors. The resistors and capacitors are fabricated
using proprietary state-of-the-art thin film technology.
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CAMDs solution is silicon-based and has the same reliability characteristics
as todays microprocessor products. The device is protected from ESD discharges to over 4,000 volts.
Absolute Tolerance (R)
Absolute Tolerance (C)
Operating Temperature Range
V
CC
Power Rating/Resistor
Maximum Leakage Current
(at V
CC
Max)
Signal Clamp Voltage:
Positive Clamp
Negative Clamp
ESD Immunity (Human Body Model)
MIL-STD -883, Method 3015
In System Protection (Note 1)
Storage Temperature
Package Power Rating
STANDARD SPECIFICATIONS
±10%
±20%
0°C to 70°C
6V max
100mW
1µA@25°C
>6V
<-6V
>4KV *
>6KV *
-65°C to 150°C
1.00W, max.
SCHEMATIC CONFIGURATION
*Guaranteed by design.
Note 1: Pins 1, 2, 12, 13, 24, and 23 grounded.
Pins 3 through 11 open, ESD contact discharge,
b e t w e e n ground and pins 14 through 22, one
at a time.
R1(
Ω
)
1K
2.2K
4.7K
4.7K
4.7K
STANDARD VALUES
R2(
Ω
)
C(pf)
RC Code
33
33
10
33
33
18 0
220
18 0
18 0
62
01
02
03
04
06
© 2000 Calirornia Micro Devices Corp. All rights reserved.
4/00
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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51mcu
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