ST ST1284 User Manual
ST1284
Parallel port single termination network with ±15 kV ESD protection
Datasheet − production data
Features
■ One device for parallel port termination
■ Compliant with IEEE1284 standard
■ EMI / RFI noise filtering
■ Highly integrated solution in 28 pins QSOP
package
■ One single device provides the proper
termination for 8 data lines, 1 strobe line, 4
control lines and 4 status lines
■ In system ESD protection of ±15 kV (air
discharge) as per IEC 61000-4-2 level 4
■ ECOPACK
®
2 compliant component
Complies with the following standards:
■ IEC 61000-4-2 level 4
– ±15 kV (air discharge)
– ±8 kV (contact discharge)
MIL STD 883G - Method 3015-7 Class 3
– ±25 kV (human body model)
Applications
ECP/EPP parallel port termination on:
■ Desktops
■ Notebooks
■ Workstations
■ Servers
■ PC peripherals
■ Set top box
Description
The ST1284-01A8 is a highly integrated
termination for enhanced high speed parallel
ports. The integrated termination complies to the
IEEE1284 Standard recommendations and
government EMC compatibility requirements. It is
built around two basic cells. The first one (cell 1)
provides line termination, EMI filtering and ESD
protection for the strobe and data lines while the
second one (cell 2) provides EMI filtering and
ESD protection for the Control and Status lines.
In addition, ST1284-01A8 provides extra
protection against ESD. When tested according to
IEC 61000-4-2, they withstand ±8 kV contact
discharges and ±15 kV air discharges, thereby
providing to the system the necessary robustness
to meet up to level 4 of IEC 61000-4-2, without the
need for additional ESD protection components.
QSOP28
TM: IPAD is a trademark of STMicroelectronics.
May 2012 Doc ID 6976 Rev 4 1/10
This is information on a product in full production.
www.st.com
10
Figure 1. Schematic diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
Vcc
R1
Rs
C
Vcc Vcc VccVcc
Vcc
Vcc
R2
Vcc
R1
C
Vcc
R1
Rs
C
R2
C
C
R2
C
R1
R1
C
C
Vcc
R1
Rs
C
Vcc
R1
Rs
C
Vcc
R1
Rs
C
Vcc
R1
Rs
C
Vcc
R1
Rs
C
ST1284
R2
C
Vcc
R1
Rs
C
Vcc
Vcc
R1
Rs
C
Vcc
R2
C
Gnd
28
27
26
25
24
23
22
21
20
19
18
17
16
1514
R1 R2 Rs C
Code 01 4.7 kΩ 4.7 kΩ 33 Ω 180 pF
Tolerance ± 10% ± 10% ± 10% ± 20%
2/10 Doc ID 6976 Rev 4
ST1284 Characteristics
1 Characteristics
Table 1. Absolute maximum ratings (T
Symbol Parameter Value Unit
ESD discharge IEC 61000-4-2, air discharge ±16
V
V
T
T
Table 2. Electrical characteristics (T
Symbol Parameter Test condition Min. Typ. Max. Unit
ESD discharge IEC 61000-4-2, contact discharge
PP
IESD discharge - MIL STD 883E - Method 3015-7
Supply voltage 5.5 V
CC
P
Power rating per resistor 100 mW
r
Package Power rating 1 Ω
P
P
Operating temperature range 0 to + 70 °C
op
Storage temperature range - 55 to + 150 °C
stg
Maximum operating junction temperature 125 °C
T
j
amb
amb
= 25 °C)
= 25 °C)
±9
± 25
kV
I
Leakage current VCC = 5.0 V 10 µA
R
V
Breakdown voltage IR = 1 mA 6 V
BR
Forward voltage drop IF = 50 mA 0.9 V
V
F
Basic cell configurations
The ST1284-01A8 is built around the two basic cells described below which integrate the
recommended IEEE1284 network and the ESD protection compatible with IEC 61000-4-2
level 4.
Doc ID 6976 Rev 4 3/10
Loading...