NEC UPD8871CY

DATA SHEET
MOS INTEGRATED CIRCUIT
µ PD8871
10680 PIXELS × 3 COLOR CCD LINEAR IMAGE SENSOR
DESCRIPTION
The µ PD8871 is a color CCD (Charge Coupled Device) linear image sensor which changes optical images to
electrical signal and has the function of color separation.
The µ PD8871 has 3 rows of 10680 pixels, and each row has a single-sided readout type of charge transfer register.
And it has reset feed-through level clamp circuits and voltage amplifiers. Therefore, it is suitable for 1200 dpi/A4 color
image scanners, color facsimiles and so on.
FEATURES
• Valid photocell
: 10680 pixels × 3
• Photocell pitch
: 4 µm
• Photocell size
: 4 × 4 µm
• Line spacing
: 32 µ m (8 lines) Red line - Green line, Green line - Blue line
• Color filter
: Primary colors (red, green and blue), pigment filter (with light resistance 10 lx•hour)
• Resolution
: 48 dot/mm A4 (210 × 297 mm) size (shorter side)
2
7
1200 dpi US letter (8.5” × 11”) size (shorter side)
:
• Drive clock level : CMOS output under 5 V operation
• Data rate
: 10 MHz Max.
• Power supply
: +12 V
• On-chip circuits
: Reset feed-through level clamp circuits
::
Voltage amplifiers
ORDERING INFORMATION
Part Number
µ PD8871CY
Package
CCD linear image sensor 32-pin plastic DIP (10.16 mm (400))
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. S15329EJ2V0DS00 (2nd edition)
Date Published September 2002 NS CP (K)
Printed in Japan
The mark
shows major revised points.
2001
µ PD8871
BLOCK DIAGRAM
GND
GND
φ2
φ1
29
1
16
22
19
30
CCD analog shift register
31
2
32
17
φ TG2
(Green)
15
φ TG3
(Red)
D66
D67
S10679
S10680
D65
φTG1
(Blue)
D66
D67
Photocell
(Green)
S10679
S10680
D65
······
D64
S1
S2
Transfer gate
CCD analog shift register
D66
D67
Photocell
(Red)
S10679
S10680
D65
······
D64
S1
S2
Transfer gate
D14
VOUT3
(Red)
Photocell
(Blue)
18
CCD analog shift register
D14
VOUT2
(Green)
······
D64
S1
S2
Transfer gate
D14
VOUT1
(Blue)
VOD
2
4
3
11
14
φ CLB
φ RB
φ 1L
φ2
φ1
Data Sheet S15329EJ2V0DS
µ PD8871
PIN CONFIGURATION (Top View)
CCD linear image sensor 32-pin plastic DIP (10.16 mm (400))
• µ PD8871CY
32
VOUT3
Output signal 3 (Red)
Reset feed-through level
clamp clock
φ CLB
2
31
VOUT2
Output signal 2 (Green)
Last stage shift register clock 1
φ 1L
3
30
VOUT1
Output signal 1 (Blue)
Reset gate clock
φ RB
4
29
VOD
Output drain voltage
No connection
NC
5
28
NC
No connection
Internal connection
IC
6
27
IC
Internal connection
Internal connection
IC
7
26
IC
Internal connection
No connection
NC
8
25
NC
No connection
No connection
NC
9
24
NC
No connection
No connection
NC
10
23
NC
No connection
Shift register clock 2
φ2
11
22
φ2
Shift register clock 2
Internal connection
IC
12
21
IC
Internal connection
Internal connection
IC
13
20
IC
Internal connection
Shift register clock 1
φ1
14
19
φ1
Shift register clock 1
Transfer gate clock 3
(for Red)
φ TG3
15
18
φ TG1
Transfer gate clock 1
(for Blue)
Ground
GND
16
17
φ TG2
Transfer gate clock 2
(for Green)
Blue
10680
Green
10680
Red
10680
1
1
1
GND
1
Ground
Cautions 1. Leave pins 6, 7, 12, 13, 20, 21, 26, 27 (IC) unconnected.
2. Connect the No connection pins (NC) to GND.
Data Sheet S15329EJ2V0DS
3
µ PD8871
PHOTOCELL STRUCTURE DIAGRAM
PHOTOCELL ARRAY STRUCTURE DIAGRAM
(Line spacing)
4 µm
4 µm
2 µm
Blue photocell array
2 µm
8 lines
(32 µm)
Channel stopper
4 µm
Green photocell array
8 lines
(32 µm)
Aluminum
shield
4
4 µm
Data Sheet S15329EJ2V0DS
Red photocell array
µ PD8871
ABSOLUTE MAXIMUM RATINGS (TA = +25°°C)
Parameter
Symbol
Ratings
Unit
Output drain voltage
VOD
−0.3 to +15
V
Shift register clock voltage
Vφ 1, Vφ 2, Vφ 1L
−0.3 to +8
V
Reset gate clock voltage
Vφ RB
−0.3 to +8
V
Reset feed-through level clamp
Vφ CLB
−0.3 to +8
V
Vφ TG1 to Vφ TG3
−0.3 to +8
V
clock voltage
Transfer gate clock voltage
Note
Operating ambient temperature
TA
0 to +60
°C
Storage temperature
Tstg
−40 to +70
°C
Note
Use at the condition without dew condensation.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the
verge of suffering physical damage, and therefore the product must be used under conditions that
ensure that the absolute maximum ratings are not exceeded.
RECOMMENDED OPERATING CONDITIONS (TA = +25°°C)
Min.
Typ.
Max.
Unit
Output drain voltage
Parameter
VOD
Symbol
11.4
12.0
12.6
V
Shift register clock high level
Vφ 1H, Vφ 2H, Vφ 1LH
4.75
5.0
5.5
V
Shift register clock low level
Vφ 1L, Vφ 2L, Vφ 1LL
−0.3
0
+0.25
V
Reset gate clock high level
Vφ RBH
4.5
5.0
5.5
V
Reset gate clock low level
Vφ RBL
−0.3
0
+0.5
V
Reset feed-through level clamp clock
Vφ CLBH
4.5
5.0
5.5
V
Vφ CLBL
−0.3
0
+0.5
V
Transfer gate clock high level
Vφ TG1H to Vφ TG3H
4.75
Vφ 1H
Transfer gate clock low level
Vφ TG1L to Vφ TG3L
−0.3
0
+0.15
V
Data rate
fφ RB
−
2.0
10.0
MHz
high level
Reset feed-through level clamp clock
low level
Note
Note
Vφ 1H
V
Note When Transfer gate clock high level (Vφ TG1H to Vφ TG3H) is higher than Shift register clock high level (Vφ 1H),
Image lag can increase.
Data Sheet S15329EJ2V0DS
5
µ PD8871
ELECTRICAL CHARACTERISTICS
TA = +25°C, VOD = 12 V, data rate (fφ RB) = 2 MHz, storage time = 5.5 ms, input signal clock = 5 Vp-p,
light source : 3200 K halogen lamp + C-500S (infrared cut filter, t = 1 mm) + HA-50 (heat absorbing filter, t = 3 mm)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Vsat
2.5
3.2
−
V
Red
SER
−
0.889
−
lx•s
Green
SEG
−
0.970
−
lx•s
Blue
SEB
−
1.455
−
lx•s
Saturation voltage
Saturation exposure
Test Conditions
Photo response non-uniformity
PRNU
VOUT = 1.0 V
−
6
20
%
Average dark signal
ADS
Light shielding
−
0.2
4.0
mV
Dark signal non-uniformity
DSNU
Light shielding
−
1.0
4.0
mV
Power consumption
PW
−
360
540
mW
Output impedance
ZO
−
0.30
1.00
kΩ
Red
RR
2.52
3.60
4.68
V/lx•s
Green
RG
2.31
3.30
4.29
V/lx•s
Blue
RB
1.54
2.20
2.86
V/lx•s
−
1.0
7.0
%
4.5
6.0
7.5
V
Response
Image lag
Offset level
IL
Note 1
Output fall delay time
VOUT = 1.0 V
VOS
Note 2
td
VOUT = 1.0 V, (t1’) = 5 ns
−
25
−
ns
TTE
VOUT = 1.0 V, data rate = 10 MHz
92
98
−
%
Red
−
630
−
nm
Green
−
540
−
nm
Total transfer efficiency
Response peak
−
460
−
nm
DR1
Vsat/DSNU
−
3200
−
times
DR2
Vsat/σ CDS
−
3200
−
times
RFTN
Light shielding
−2000
+100
+1000
mV
σ CDS
Light shielding
−
1.0
−
mV
Blue
Dynamic range
Reset feed-through noise
Random noise (CDS)
Note 1
Notes 1. Refer to TIMING CHART 2, 3.
2. When the fall time of φ 1L (t1’) is the Typ. value (refer to TIMING CHART 2, 3).
6
Data Sheet S15329EJ2V0DS
µ PD8871
INPUT PIN CAPACITANCE (TA = +25°°C, VOD = 12 V)
Parameter
Symbol
Shift register clock pin capacitance 1
Cφ 1
Shift register clock pin capacitance 2
Cφ 2
Pin
φ1
φ2
Pin No.
Min.
Typ.
Max.
Unit
14
−
450
−
pF
19
−
450
−
pF
11
−
450
−
pF
22
−
450
−
pF
Last stage shift register clock pin capacitance
Cφ L
φ 1L
3
−
10
−
pF
Reset gate clock pin capacitance
Cφ RB
φ RB
4
−
10
−
pF
Reset feed-through level clamp clock pin capacitance
Cφ CLB
φ CLB
2
−
10
−
pF
Transfer gate clock pin capacitance
Cφ TG
φ TG1
18
−
100
−
pF
φ TG2
17
−
100
−
pF
φ TG3
15
−
100
−
pF
Remark Pin 14 and 19 (φ 1), 11 and 22 (φ 2) are each connected inside of the device.
Data Sheet S15329EJ2V0DS
7
8
TIMING CHART 1 (for each color)
φ TG1 to φ TG3
φ 1, φ 1L
φ2
Note
Note
φ CLB
(Bit clamp mode)
10743
10744
10745
10746
10747
10748
10749
61
62
63
64
65
66
φ CLB
(Line clamp mode)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Data Sheet S15329EJ2V0DS
φ RB
VOUT1 to VOUT3
Optical black
(48 pixels)
Valid photocell
(10680 pixels)
Invalid photocell
(3 pixels)
And stop the φ RB pulse while the φ CLB pulse is low level at line clamp mode.
Remark Inverse pulse of the φ TG1 to φ TG3 can be used as φ CLB at line clamp mode.
µ PD8871
Note Set the φ RB pulse to high level during the φ TG1 to φ TG3 pulse.
Invalid photocell
(3 pixels)
µ PD8871
TIMING CHART 2 (Bit clamp mode, for each color)
t1
t2
90%
φ1
10%
90%
φ2
10%
t1'
90%
φ 1L
10%
t5
φ RB
t2'
t6
t3
t4
90%
10%
t9
t7
t8
t10
t11
90%
φ CLB
10%
td
RFTN
VOUT
VOS
10%
Symbol
Min.
Typ.
Max.
Unit
0
25
−
ns
t1, t2
t1’, t2’
0
5
−
ns
t3
20
100
−
ns
t4
40
150
−
ns
t5, t6
0
25
−
ns
−5
Note
25
−
ns
t8
20
100
−
ns
t9, t10
0
25
−
ns
t11
10
25
−
ns
t7
Note Min. of t7 shows that the φ RB and φ CLB overlap each other.
90%
φ RB
t7
φ CLB
90%
Data Sheet S15329EJ2V0DS
9
µ PD8871
TIMING CHART 3 (Line clamp mode, for each color)
t1
t2
90%
φ1
10%
90%
φ2
10%
t1'
90%
φ 1L
10%
t5
t6
t3
t4
90%
φ RB
φ CLB
t2'
10%
"H"
td
RFTN
VOUT
VOS
10%
Symbol
t1, t2
10
Min.
Typ.
Max.
Unit
0
25
−
ns
t1’, t2’
0
5
−
ns
t3
20
100
−
ns
t4
40
150
−
ns
t5, t6
0
25
−
ns
Data Sheet S15329EJ2V0DS
µ PD8871
φ TG1 to φ TG3, φ 1, φ 2 TIMING CHART
t13
t14
t12
90%
10%
t15
φ TG1 to φ TG3
t16
90%
φ 1, φ 1L
φ2
90%
φ 1, φ 1L
t17
Note 1
t18
90%
φ RB
t7
t11
90%
φ CLB
(Bit clamp mode)
t20
t22
t21
Note 2
t23
90%
10%
φ CLB
(Line clamp mode)
t9
Symbol
Min.
−5
t7
t9, t10
Note 3
0
t19
t10
Typ.
Max.
Unit
25
−
ns
25
−
ns
t11
10
25
−
ns
t12
5000
10000
50000
ns
t13, t14
0
50
−
ns
t15, t16
900
1000
−
ns
t17, t18
200
400
−
ns
t19
t12
t12
50000
ns
t20, t21
0
50
−
ns
t22, t23
0
350
−
ns
Notes 1. Set the φ RB pulse to high level during this period.
2. Stop the φ RB pulse during this period.
3. Min. of t7 shows that the φ RB and φ CLB overlap each other.
Remark Inverse pulse of the φ TG1 to φ TG3 can be used as φ CLB.
φ 1, φ 2 cross points
φ2
φ1
2 V or more
2 V or more
φ 1L, φ 2 cross points
φ2
φ 1L
2 V or more
0.5 V or more
Remark Adjust cross points (φ 1, φ 2) and (φ 1L, φ 2) with input resistance of each pin.
Data Sheet S15329EJ2V0DS
11
µ PD8871
DEFINITIONS OF CHARACTERISTIC ITEMS
1. Saturation voltage : Vsat
Output signal voltage at which the response linearity is lost.
2. Saturation exposure : SE
Product of intensity of illumination (lx) and storage time (s) when saturation of output voltage occurs.
3. Photo response non-uniformity : PRNU
The output signal non-uniformity of all the valid pixels when the photosensitive surface is applied with the light
of uniform illumination. This is calculated by the following formula.
PRNU (%) =
∆x
× 100
x
∆ x : maximum of xj − x 
10680
Σx
x=
j
j=1
10680
xj : Output voltage of valid pixel number j
VOUT
Register Dark
DC level
x
∆x
4. Average dark signal : ADS
Average output signal voltage of all the valid pixels at light shielding. This is calculated by the following
formula.
10680
Σd
ADS (mV) =
j
j=1
10680
dj : Dark signal of valid pixel number j
12
Data Sheet S15329EJ2V0DS
µ PD8871
5. Dark signal non-uniformity : DSNU
Absolute maximum of the difference between ADS and voltage of the highest or lowest output pixel of all the
valid pixels at light shielding. This is calculated by the following formula.
DSNU (mV) : maximum of dj − ADS j = 1 to 10680
dj : Dark signal of valid pixel number j
VOUT
ADS
Register Dark
DC level
DSNU
6. Output impedance : ZO
Impedance of the output pins viewed from outside.
7. Response : R
Output voltage divided by exposure (lx•s).
Note that the response varies with a light source (spectral characteristic).
8. Image lag : IL
The rate between the last output voltage and the next one after read out the data of a line.
φ TG
Light
ON
OFF
VOUT
V1
VOUT
IL (%) =
V1
× 100
VOUT
Data Sheet S15329EJ2V0DS
13
µ PD8871
9. Random noise (CDS) : σ CDS
Random noise σ CDS is defined as the standard deviation of a valid pixel output signal with 100 times (=100
lines) data sampling at dark (light shielding). σ CDS is calculated by the following procedure.
1. One valid photocell in one reading is fixed as measurement point.
2. The output level is measured during the reset feed-through period which is averaged over 100 ns to get
“VDi”.
3. The output level is measured during the video output time averaged over 100 ns to get “VOi”.
4. The correlated double sampling output is defined by the following formula.
VCDSi = VDi – VOi
5. Repeat the above procedure (1 to 4) for 100 times (= 100 lines).
6. Calculate the standard deviation σ CDS using the following formula equation.
100
σ CDS (mV) =
Σ (VCDS – V)
i
2
i=1
100
, V=
1
100
Σ VCDS
100 i = 1
Reset feed-through
Video output
14
Data Sheet S15329EJ2V0DS
i
µ PD8871
STANDARD CHARACTERISTIC CURVES (Reference Value)
DARK OUTPUT TEMPERATURE
CHARACTERISTIC
STORAGE TIME OUTPUT VOLTAGE
CHARACTERISTIC (TA = +25°C)
8
2
1
Relative Output Voltage
2
1
0.5
0.2
0.25
0.1
0
10
20
30
40
0.1
50
Operating Ambient Temperature TA (°C)
1
5
10
Storage Time (ms)
TOTAL SPECTRAL RESPONSE CHARACTERISTICS
(without infrared cut filter and heat absorbing filter) (TA = +25°C)
100
R
G
B
80
Response Ratio (%)
Relative Output Voltage
4
60
40
G
20
B
0
400
500
600
700
800
Wavelength (nm)
Data Sheet S15329EJ2V0DS
15
µ PD8871
APPLICATION CIRCUIT EXAMPLE
+5 V
+
µ PD8871
1
10 µ F/16 V 0.1 µ F
47 Ω
φ CLB
150 Ω
φ 1L
47 Ω
φ RB
2
3
4
32
GND
VOUT3
φ CLB
VOUT2
φ 1L
VOUT1
φ RB
VOD
NC
NC
IC
IC
IC
IC
NC
NC
26
NC
NC
NC
NC
φ2
φ2
IC
IC
IC
IC
φ1
φ1
16
22
φ TG
4.7 Ω
20
φ TG3
φ TG1
GND
φ TG2
19
4.7 Ω
18
4.7 Ω
17
4.7 Ω
Leave pins 6, 7, 12, 13, 20, 21, 26, 27 (IC) unconnected.
Connect the No connection pins (NC) to GND.
Data Sheet S15329EJ2V0DS
10 µ F/16 V
φ1
21
16
2.
0.1 µ F
23
13
Cautions 1.
+
24
12
15
47 µ F/25 V
+5 V
25
10
4.7 Ω
0.1 µ F
27
9
14
+
28
8
4.7 Ω
B1
29
7
11
B2
30
6
4.7 Ω
+12 V
31
5
φ2
B3
µ PD8871
Remarks 1. B1 to B3 in the application circuit example are shown in the figure below.
B1 to B3 EQUIVALENT CIRCUIT
12 V
+
100 Ω
CCD
VOUT
100 Ω
47 µ F/25 V
2SC945
2 kΩ
2. Number and type of inverters in the application circuit example are different by data rate.
The following table shows the recommended number and type of inverters for data rate.
Pin Name
Pin No.
Data Rate (MHz)
Inverter
Type
Number (each pin)
φ CLB
2
(data rate) < 10
74HC04
1
φ 1L
3
(data rate) < 2
74HC04
1
2 ≤ (data rate) < 10
74AC04
1
(data rate) < 10
74HC04
1
φ RB
4
φ 1, φ 2
14, 19, 11, 22
φ TG1 to φ TG3
18, 17, 15
(data rate) < 2
74HC04
1
2 ≤ (data rate) < 6
74AC04
1
6 ≤ (data rate) < 10
74AC04
3
(data rate) < 10
74HC04
1
Data Sheet S15329EJ2V0DS
17
µ PD8871
PACKAGE DRAWING
µ PD8871CY
CCD LINEAR IMAGE SENSOR 32-PIN PLASTIC DIP (10.16 mm (400) )
(Unit : mm)
55.2±0.5
54.8±0.5
1st valid pixel
6.15±0.3
1
1
9.25±0.3
17
9.05±0.3
32
16
46.7
2.0
12.6±0.5
4.1±0.5
10.16±0.20
4.55±0.5
1.02±0.15
(1.80)
2
2.58±0.3
0.46±0.1
2.54±0.25
0.25±0.05
(5.42)
4.21±0.5
3
10.16 +0.7
−0.2
Name
Dimensions
Refractive index
Plastic cap
52.2×6.4×0.7
1.5
1 1st valid pixel
The center of the pin1
2 The surface of the CCD chip
The top of the cap
3 The bottom of the package
The surface of the CCD chip
32C-1CCD-PKG5-1
18
Data Sheet S15329EJ2V0DS
µ PD8871
RECOMMENDED SOLDERING CONDITIONS
When soldering this product, it is highly recommended to observe the conditions as shown below.
If other soldering processes are used, or if the soldering is performed under different conditions, please make sure
to consult with our sales offices.
Type of Through-hole Device
µ PD8871CY : CCD linear image sensor 32-pin plastic DIP (10.16 mm (400))
Process
Partial heating method
Conditions
Pin temperature : 300°C or below, Heat time : 3 seconds or less (per pin)
Cautions 1. During assembly care should be taken to prevent solder or flux from contacting the plastic
cap. The optical characteristics could be degraded by such contact.
2. Soldering by the solder flow method may have deleterious effects on prevention of plastic cap
soiling and heat resistance. So the method cannot be guaranteed.
Data Sheet S15329EJ2V0DS
19
µ PD8871
NOTES ON HANDLING THE PACKAGES
1 DUST AND DIRT PROTECTING
The optical characteristics of the CCD will be degraded if the cap is scratched during cleaning. Don’t either
touch plastic cap surface by hand or have any object come in contact with plastic cap surface. Should dirt
stick to a plastic cap surface, blow it off with an air blower. For dirt stuck through electricity ionized air is
recommended. And if the plastic cap surface is grease stained, clean with our recommended solvents.
CLEANING THE PLASTIC CAP
Care should be taken when cleaning the surface to prevent scratches.
We recommend cleaning the cap with a soft cloth moistened with one of the recommended solvents below.
Excessive pressure should not be applied to the cap during cleaning. If the cap requires multiple cleanings it is
recommended that a clean surface or cloth be used.
RECOMMENDED SOLVENTS
The following are the recommended solvents for cleaning the CCD plastic cap.
Use of solvents other than these could result in optical or physical degradation in the plastic cap.
Please consult your sales office when considering an alternative solvent.
Solvents
Symbol
Ethyl Alcohol
Methyl Alcohol
EtOH
MeOH
Isopropyl Alcohol
N-methyl Pyrrolidone
IPA
NMP
2 MOUNTING OF THE PACKAGE
The application of an excessive load to the package may cause the package to warp or break, or cause chips
to come off internally. Particular care should be taken when mounting the package on the circuit board. Don't
have any object come in contact with plastic cap. You should not reform the lead frame. We recommended to
use a IC-inserter when you assemble to PCB.
Also, be care that the any of the following can cause the package to crack or dust to be generated.
1. Applying heat to the external leads for an extended period of time with soldering iron.
2. Applying repetitive bending stress to the external leads.
3. Rapid cooling or heating
3 OPERATE AND STORAGE ENVIRONMENTS
Operate in clean environments. CCD image sensors are precise optical equipment that should not be subject
to mechanical shocks. Exposure to high temperatures or humidity will affect the characteristics. So avoid
storage or usage in such conditions.
Keep in a case to protect from dust and dirt. Dew condensation may occur on CCD image sensors when the
devices are transported from a low-temperature environment to a high-temperature environment. Avoid such
rapid temperature changes.
For more details, refer to our document "Review of Quality and Reliability Handbook" (C12769E)
4 ELECTROSTATIC BREAKDOWN
CCD image sensor is protected against static electricity, but destruction due to static electricity is sometimes
detected. Before handling be sure to take the following protective measures.
1. Ground the tools such as soldering iron, radio cutting pliers of or pincer.
2.
3.
4.
5.
Install a conductive mat or on the floor or working table to prevent the generation of static electricity.
Either handle bare handed or use non-chargeable gloves, clothes or material.
Ionized air is recommended for discharge when handling CCD image sensor.
For the shipment of mounted substrates, use box treated for prevention of static charges.
6. Anyone who is handling CCD image sensors, mounting them on PCBs or testing or inspecting PCBs on
which CCD image sensors have been mounted must wear anti-static bands such as wrist straps and ankle
straps which are grounded via a series resistance connection of about 1 MΩ.
20
Data Sheet S15329EJ2V0DS
µ PD8871
[MEMO]
Data Sheet S15329EJ2V0DS
21
µ PD8871
[MEMO]
22
Data Sheet S15329EJ2V0DS
µ PD8871
NOTES FOR CMOS DEVICES
1
PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
Note:
Strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and
ultimately degrade the device operation. Steps must be taken to stop generation of static electricity
as much as possible, and quickly dissipate it once, when it has occurred. Environmental control
must be adequate. When it is dry, humidifier should be used. It is recommended to avoid using
insulators that easily build static electricity. Semiconductor devices must be stored and transported
in an anti-static container, static shielding bag or conductive material. All test and measurement
tools including work bench and floor should be grounded. The operator should be grounded using
wrist strap. Semiconductor devices must not be touched with bare hands. Similar precautions need
to be taken for PW boards with semiconductor devices on it.
2
HANDLING OF UNUSED INPUT PINS FOR CMOS
Note:
No connection for CMOS device inputs can be cause of malfunction. If no connection is provided
to the input pins, it is possible that an internal input level may be generated due to noise, etc., hence
causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels
of CMOS devices must be fixed high or low by using a pull-up or pull-down circuitry. Each unused
pin should be connected to V DD or GND with a resistor, if it is considered to have a possibility of
being an output pin. All handling related to the unused pins must be judged device by device and
related specifications governing the devices.
3
STATUS BEFORE INITIALIZATION OF MOS DEVICES
Note:
Power-on does not necessarily define initial status of MOS device. Production process of MOS
does not define the initial operation status of the device. Immediately after the power source is
turned ON, the devices with reset function have not yet been initialized. Hence, power-on does
not guarantee out-pin levels, I/O settings or contents of registers. Device is not initialized until the
reset signal is received. Reset operation must be executed immediately after power-on for devices
having reset function.
Data Sheet S15329EJ2V0DS
23
µ PD8871
• The information in this document is current as of September, 2002. The information is subject to
change without notice. For actual design-in, refer to the latest publications of NEC's data sheets or
data books, etc., for the most up-to-date specifications of NEC semiconductor products. Not all
products and/or types are available in every country. Please check with an NEC sales representative
for availability and additional information.
• No part of this document may be copied or reproduced in any form or by any means without prior
written consent of NEC. NEC assumes no responsibility for any errors that may appear in this document.
• NEC does not assume any liability for infringement of patents, copyrights or other intellectual property rights of
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• Descriptions of circuits, software and other related information in this document are provided for illustrative
purposes in semiconductor product operation and application examples. The incorporation of these
circuits, software and information in the design of customer's equipment shall be done under the full
responsibility of customer. NEC assumes no responsibility for any losses incurred by customers or third
parties arising from the use of these circuits, software and information.
• While NEC endeavours to enhance the quality, reliability and safety of NEC semiconductor products, customers
agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize
risks of damage to property or injury (including death) to persons arising from defects in NEC
semiconductor products, customers must incorporate sufficient safety measures in their design, such as
redundancy, fire-containment, and anti-failure features.
• NEC semiconductor products are classified into the following three quality grades:
"Standard", "Special" and "Specific". The "Specific" quality grade applies only to semiconductor products
developed based on a customer-designated "quality assurance program" for a specific application. The
recommended applications of a semiconductor product depend on its quality grade, as indicated below.
Customers must check the quality grade of each semiconductor product before using it in a particular
application.
"Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio
and visual equipment, home electronic appliances, machine tools, personal electronic equipment
and industrial robots
"Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster
systems, anti-crime systems, safety equipment and medical equipment (not specifically designed
for life support)
"Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life
support systems and medical equipment for life support, etc.
The quality grade of NEC semiconductor products is "Standard" unless otherwise expressly specified in NEC's
data sheets or data books, etc. If customers wish to use NEC semiconductor products in applications not
intended by NEC, they must contact an NEC sales representative in advance to determine NEC's willingness
to support a given application.
(Note)
(1) "NEC" as used in this statement means NEC Corporation and also includes its majority-owned subsidiaries.
(2) "NEC semiconductor products" means any semiconductor product developed or manufactured by or for
NEC (as defined above).
M8E 00. 4