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
Characteristics ST1284
Figure 2. Cell 1 for line termination, EMI
filtering and ESD protection for the
data lines and strobe signals
Vcc
IEEE1284
Recommendation
Figure 3. Cell 2 for EMI filtering and ESD
protection of the control and status
signals
Vcc
IEEE1284
Recommendation
Rp
Rp
Rs
C
Gnd
There are 9 of these cells in the ST1284-xxA8
Figure 4. Functional diagram
17 Select in
16 Reset
15 Error
14 Autofeed
Vcc
1 Strobe
2 Bit 1
3 Bit 2
4 Bit 3
5 Bit 4
6 Bit 5
7 Bit 6
8 Bit 7
9 Bit 8
10 Acknowledge
11 Busy
12 Paper Out
13 Select paper
1
2
20
3
4
5
6
7
9
11
13
14
8
10
ST1284-xxA8
Vcc
Vcc
C
Gnd
There are 8 of these cells in the ST1284-xxA8
28
27
1
26
25
24
23
21
19
18
17
16
12
15
22
Gnd
14
25
13
4/10 Doc ID 6976 Rev 4
ST1284 Application information
2 Application information
The functional diagram here above presents a IEEE1284-A connector pinout and show how
to connect the ST1284-01A8 in order to correctly terminate and filter the 17 signal lines. The
IEEE1284-A connector is the PC standard for the host connection.
Control and status lines (from 10 to 17) only require a pull-up resistor (R
capacitor (C).
The data lines (from 2 to 9) and the STROBE (pin 1) also require a termination series
resistor (R
pin 20 and the ground to pin 22.
The ST1284-01A8 can be used with all 3 types of connectors defined in the IEEE1284
standard:
) in addition to the pull-up resistor and a filter capacitor. The VCC is connected to
s
– IEEE1284-A is a 25 dB connector which is the PC standard for the host
connection.
– IEEE1284-B is a 36 pin, 0.085 inch center line connector used on the peripheral
device.
– IEEE1284-C is a new 36 pin, 0.050 inch center line connector which can be used
for both host and peripherals.
) and a filter
p
Doc ID 6976 Rev 4 5/10
Technical information ST1284
dB
F (MHz)
3 Technical information
3.1 Frequency behavior of data and strobe signals
Figure 5. Measurement conditions Figure 6. Typical frequency response curve
for data and STROBE signal
0.00
TRACKING
GENERATOR
Vg
50
+5V
Ω
SPECTRUM
ANALYSER
ST1284
50
VoutVin
Ω
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
1 3 10 30 100 300 1,000
3.2 ESD protection
In addition to the requirements of termination and EMC compatibility, computing devices are
required to be tested for ESD susceptibility. This test is described in the IEC 61000-4-2 and
is already in place in Europe. This test requires that a device tolerates ESD events and
remain operational without user intervention.
The ST1284-01A8 is particularly optimized to perform ESD protection. ESD protection is
based on the use of device which clamps at:
V
= VBR + Rd · I
ouput
PP
This protection function is split in 2 stages. As shown in Figure 7, the ESD strikes are
clamped by the first stage S
and then its remaining overvoltage is applied to the second
1
stage through the resistor R. Such a configuration makes the voltage very low at the output.
Figure 7. ST1284 ESD clamping behavior
Rg
ESD Surge
S1
Rd
V
BR
R
Vinput
Voutput
ST1284-xxA8
S2
Rd
Rload
V
BR
Device
to be
protected
6/10 Doc ID 6976 Rev 4
ST1284 Technical information
To have a good approximation of the remaining voltages at both Vin and V
the typical dynamic resistance value R
.
d
stages, we give
out
By taking into account these following hypothesis:
R
, Rg>Rd and R
t>Rd
load>Rd
The results of the calculation done for V
V
= 7 V (typ.) and Rd = 1 Ω (typ.) give:
BR
–V
–V
input
output
= 31.2 V
= 7.95 V
, it gives these formulas:
R
Vinput
Voutput
gVBRRdVPP
---------------------------------------------------=
PP
R
g
R
tVBRRd
----------------------------------------------------------=
R
= 8 kV, Rg= 330 Ω (IEC 61000-4-2 standard),
⋅+⋅
Vinput⋅+⋅
t
This confirms the very low remaining voltage across the device to be protected. It is also
important to note that in this approximation the parasitic inductance effect was not taken into
account. This could be few tenths of volts during few ns at the input side. This parasitic effect
is not present at the output side due the low current involved after the resistance R.
The measurements done here after show very clearly (Figure 9) the high efficiency of the
ESD protection:
– no influence of the parasitic inductances on V
–V
clamping voltage very close to VBR (positive strike) and -VF (negative
output
out
stage
strike)
Figure 8. Measurement conditions
ESD
SURGE
Vinput Voutput
ST1284
Figure 9. Remaining voltage at the input and output of the device during a ±16 kV
ESD surge (IEC 61000-4-2)
Doc ID 6976 Rev 4 7/10
Package information ST1284
4 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK
Table 3. QSOP28 dimensions
28 15
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
.
Dimensions
Ref.
L
Millimeters Inches
Min. Max. Min. Max.
A 1.55 1.75 0.061 0.069
A
S
b
D
a1
e
E
a1 0.10 0.25 0.004 0.010
b1
b 0.20 0.30 0.008 0.012
b1 0.18 0.25 0.007 0.010
D 9.80 9.98 0.386 0.393
1
14
F
E 3.80 3.98 0.15 0.157
e 0.64 typ. 0.025 typ.
F 5.79 6.20 0.228 0.244
L 0.40 0.90 0.016 0.035
S 8° max 8° max
Figure 10. Footprint (dimensions in mm)
Table 4. Mechanical specifications
Lead plating Tin-lead
Lead plating thickness
Lead material Copper Alloy
Lead coplanarity 0.102 mm (0.004”)
Body material Molded epoxy
Resin Meets UL94V-0 standard
0.64 0.40
1.50
3.70
6.70
7 µm min.
25 µm max.
8/10 Doc ID 6976 Rev 4
ST1284 Ordering information
5 Ordering information
Table 5. Ordering information
Order code Marking Package Weight Base qty Delivery mode
ST1284-01A8 ST1284-01
ST1284-01A8RL ST1284-01 2500 Tape and Reel
6 Revision history
Table 6. Document revision history
Date Revision Changes
Oct-2003 2B Last release.
12-Mar-2010 3 Updated table in Figure 1 and Figure 10.
11-May-2012 4 Updated Ta bl e 3 .
QSOP28 0.147 g
48 Tube
Doc ID 6976 Rev 4 9/10
ST1284
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10/10 Doc ID 6976 Rev 4
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