NEC PD16855A, PD16855B, PD16855C, PD16855D Technical data

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DUAL HIGH-SIDE SWITCH FOR USB APPLICATION

DESCRIPTION

This product is the power switch IC with over current limit, used for the power supply bus of the Universal-Serial-

Bus (USB).

2 circuit builds in the Pch power MOSFET in the switch part, and this product realizes low on resistance (100 m

TYP.) respectively.

And the over current detection, the thermal-shutdown circuit, an under voltage locked-out (UVLO) circuit whose

functions are necessary in the Host/HUB-controller of the USB standard are built in.

And the over-current-detect result can be reported to the controller by flag-pin. This product builds in each two circuits of the power switch, control-pins and flag-pins, and this IC can be able to

control the power supply bus in 2 USB port.

There are four kinds of this product by the input logic of the control signal and switch operation in over-current

detect.

DATA SHEET

MOS INTEGRATED CIRCUIT

µµµµ

PD16855A/B/C/D

Ω

FEATURES

•Pch power MOSFET, 2 circuit building in

•Over-current detection circuit is built in and its result is outputted from flag-pin (“L” active)

•Prevent from dropping power supply by over current limit circuit

•Thermal shutdown circuit building in

•Under Voltage Locked Out (UVLO) circuit building in

•Switch on/off control is possible by the control-pin.

•8 pin DIP/SOP package

ORDERING INFORMATION

PART NO. PACKAGE

PD16855BC 8-pin plastic DIP (300mil)

PD16855AG 8-pin plastic SOP (225mil)

PD16855BG 8-pin plastic SOP (225mil)

PD16855CG 8-pin plastic SOP (225mil)

PD16855DG 8-pin plastic SOP (225mil)

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. S13020EJ1V0DS00 (1st edition) Date Published February 1999 N CP(K) Printed in Japan

1998©

BLOCK DIAGRAM

IN (Input)

µµµµ

PD16855

OUT1

(Output1)

FLG1

(Flag Out1)

Ref.

Voltage

Over Current

Detect

GND

Gate

Control

CTL1

(Control Input1)

UVLO

Thermal

Shutdown

Gate

Control

CTL2

(Control Input2)

Ref.

Voltage

Over Current

Detect

OUT2

(Output2)

FLG2

(Flag Out2)

The internal resister doesn’t connect to input terminal of CTL1 (1 pin) and CTL2 (4 pin).

Note

Therefore the input level must be “H” or “L” even if these pins aren’t used.

Data Sheet S13020EJ1V0DS00

CONNECTION DIAGRAM (TOP VIEW)

1CTL1 OUT18

2FLG1 IN7

3FLG2 GND6

4CTL2 OUT25

8-Pin DIP/SOP

PIN CONFIGURATION

PIN No. SYMBOL I/O FUNCTION

1/4 CTL1/CTL2 Input Control : TTL Input

2/3 FLG1/FLG2 Output Over Current Detect Flag : Ac tive-L, Nch open-drain

6 GND Power G round 7 IN Power (Input) Power Supply : Source of MO S F ET

8/5 OUT1/OUT2 Output Output of Switch : Drain of MOSFET

µµµµ

PD16855

DESCRIPTION of

PART No.

PD16855AG “H” active Over-Current Limit Operation. Switch Off with CTL Input “L”

PD16855BC/BG “L” active Over-Current Lim i t Operation. Switch Off wit h CTL Input “H”

PD16855CG “H” active

PD16855DG “L” active

PD16855A/B/C/D FUNCTION

µµµµ

Abstract of Functi on

CTL Input Logic Switch Operation with Over-Current Detect

Switch Off regardless of CTL Input

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

PIN CONFIGURATION

PD16855AG (Active-H)

µµµµ

CTL1 FLG1 OUT1 CTL2 FLG2 OUT2 Operating mode

H H ON H H ON normal mode H H ON L H OFF only OUT1 is ON L H OFF H H ON only OUT2 is ON L H OFF L H OFF st andby m ode H L ON H H ON only OUT1 is over-current detect H H ON H L ON only OUT2 is over-current detect X L OFF X L OFF TSD mode X L OFF X L OFF UVLO mode

PD16855BC/BG (Active-L)

µµµµ

CTL1 FLG1 OUT1 CTL2 FLG2 OUT2 Operating mode

L H ON L H ON normal mode L H ON H H OFF only OUT1 is ON H H OFF L H ON only OUT2 is ON H H OFF H H OFF standby mode L L ON L H ON only OUT1 is over-current detect L H ON L L ON only OUT2 is over-current detect X L OFF X L OFF TSD mode X L OFF X L OFF UVLO mode

(H:Hi-level, L:Low-level, ON:output ON state, OFF:output OFF state, X:H or L)

Data Sheet S13020EJ1V0DS00

PD16855CG (Active-H and Switch off with over-current detect)

µµµµ

CTL1 FLG1 OUT1 CTL2 FLG2 OUT2 Operating mode

H H ON H H ON normal mode H H ON L H OFF only OUT1 is ON L H OFF H H ON only OUT2 is ON L H OFF L H OFF st andby m ode H L OFF H H ON only OUT1 is over-current detect H H ON H L OFF only OUT2 is over-current detect X L OFF X L OFF TSD mode X L OFF X L OFF UVLO mode

PD16855DG (Active-L and Switch off with over-current detect)

µµµµ

CTL1 FLG1 OUT1 CTL2 FLG2 OUT2 Operating mode

L H ON L H ON normal mode L H ON H H OFF only OUT1 is ON H H OFF L H ON only OUT2 is ON H H OFF H H OFF standby mode L L OFF L H ON only OUT1 is over-current detect L H ON L L OFF only OUT2 is over-current detect X L OFF X L OFF TSD mode X L OFF X L OFF UVLO mode

µµµµ

PD16855

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

ABSOLUTE MAXIMUM RATINGS (TA = 25

Parameter Symbol Conditions Ratings Unit Input Voltage V Flag Voltage V Flag Current I Output Voltage V Output Current I

Control Input Voltage V

DIP 400Power Dissipation

SOP Operating Temperature Range T Channel Temperature Range T Storage Temperature Range T

The thermal shutdown circuit (operating temperature is more than 150 °C typ.) builds in this product.

Note

FLG

OUT

CTL

CH MAX

stg

°°°°

DC +0.5(VIN = V

Pulse Width ≤ 100µs

Single Pulse

–0.3 to +6 V –0.3 to +6 V

50 mA

VIN + 0.3 V

CTL

=5 V)

–0.1 (V

= 0V, V

OUT

= 5V)

–0.3 to +6 V

300

–40 to +85 °C

+150 °C

–55 to +150 °C

RECOMMENDED OPERATING RANGE

Parameter Symbol Min Typ Max Unit Input Voltage V Operating Temperature Range T

+4 +5.5 V

0+70°C

Data Sheet S13020EJ1V0DS00

ELECTRICAL CHARACTERISTICS DC CHARACTERISTICS (Unless otherwise specified, V

Parameter Symbol Conditions Min Typ Max Unit

= +5V; TA = +25°C)

µµµµ

PD16855

PD16855A/C)

(only

PD16855B/D)

(only

Low-level Input Voltage V High-level Input Voltage V

Output Leak Current I

O LEAK

Over Current Detect Threshold I Flag Output Resistance R Flag Leak Current I Operating Voltage of

O LEAK F

V Under Voltage Locked Out Circuit

CTL

ON F

UVLO

CTL

= 0V (both 1 pin & 4 pin),

OUT = open

CTL

= VIN, OUT = open 1 1.5 mA

CTL

= VIN (both 1 pin & 4 pin),

OUT = open

CTL

= 0V, OUT = open 1 1.5 mA CTL Pin 1.0 V CTL Pin 2.0 V

CTL

= 0V 0.01 1

CTL

= V TA = 0 to +70 °C,

OUT

= 500 mA

DIP 100 140Output MOSFET On Resis tance R SOP 100 130

0.01 1

µ µ

TA = 0 to +70 °C 0.6 0.9 1.25 A IL = 10 mA 10 25

FLAG

= 5 V 0.01 1

VIN : Up 3.2 3.5 3.7 V VIN : Down 3.0 3.3 3.5 V Hysteresis 0.1 0.2 0.3 V

ACircuit Current

AInput Current of CTL pin I A

Ω

AC CHARACTERISTICS (Unless otherwise specified, VIN = +5 V; TA = +25

Parameter Symbol Conditions Min Typ Max Unit

Output Transition Rising Time

Output Transition Falling Time

Over Current Detect Delay Time

CTL Input Low-Level Time

PD16855A/C)

(only

CTL Input High-Level Time

PD16855B/D)

(only

RISE

FALL

OVER

CTL

RL = 10 Ω each output 2.5 12 ms

RL = 10 Ω each output 10

520

CTL : H→L→H20

CTL : L→H→L20

°°°°

Data Sheet S13020EJ1V0DS00

MEASUREMENT POINT

Output Transition Rising Time (at ON)/Output Transition Falling Time (at OFF)

at the timing of CTL changing “L” to “H”/“H” to “L” for µPD16855A/C

5 V/3.3 V

µµµµ

PD16855

CTL

OUT

0 V

5 V

0 V

10%

RISE

90% 90%

at the timing of CTL changing “H” to “L”/“L” to “H” for µPD16855A/C

5 V/3.3 V

0 V

5 V

0 V

90%

RISE

90% 90%

CTL

OUT

FALL

10%

Data Sheet S13020EJ1V0DS00

Over Current Detect Delay Time/CTL Input Low-Level Time for µPD16855A/C

µµµµ

PD16855

IOUT

VOUT

FLG

CTL

tOVER

PD16855A

PD16855C

90%

90% 90%

ITH

tCTL

Over Current Detect Delay Time/CTL Input High-Level Time for µPD16855B/D

OUT

ITH

OUT

FLG

CTL

OVER

PD16855B

PD16855D

90%

CTL

10% 10%

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

FUNCTION DESCRIPTION

1. Over current detection

The specification of over current detect is 0.6 to 1.25 A (typ. 900mA) in this IC. (500 mA max. in USB standard) This function is that flag-pin turns to Low-level and reports to the USB controller when over current is detected. At this time, output of IC is operated as followed.

PD16855A/B : Output keep ON-state and over current limited circuit is operated. This function can be

•

prevented from being long-time over current state.

PD16855C/D : Output turns to off, and isn't based on the state of CTL-pin.

•

When CTL-pin turns to non-active, FLG-pin returns to High-level and Output-pin turn to OFF-state. Immediately the controller should be inputted non-active level to CTL-pin after detecting FLG = “L” not to reach to

the state of thermal shutdown.

Then, in the case of FLG-pin is High-level and CTL-pin is active level, Output-pin turns to ON-state. To prevent from detecting wrongly the current to the moment, over current detect delay time is set up. This delay time is 10 µs (typ.).

Power consumption in this device increases rapidly at the time of current-limitter circuit operation, and channel temperature Tch is likely to escalate. Make a CTL signal non-active, and make switch turn off before Tch of this device exceed absolute maximum rating.

Flg

Vout

Iout

Flg

Iout

0.5 A

5 V

0 V

0 A

5 V

0 V

1 A~

Normal Mode

more than 10 s (typ.)

in case of current surge

less then 10 s (typ.)

Controlled by CTL-pin ( PD16855A/B)

Instant Switch off ( PD16855C/D)

Over current detect threshold

PD16855 USB Device

connection to the moment, it flow the large current

OUT

Data Sheet S13020EJ1V0DS00

2. Under Voltage Locked Out (UVLO) Circuit

UVLO is the circuit for preventing malfunction of the switch by voltage variation. In the Power Up : less than 3.5 V (typ.) and in the Power Down : less than 3.3 V (typ.)

OUT : OFF FLG : “L” ( = 0V)

5 V

Output

3.3 V 3.5 V 5 V Input

µµµµ

PD16855

3. Behavior in the case of Power ON

This IC is slowly started up by Soft-Start Operation when IC is powered on. This function is to prevent from flowing large current in the period of charging the capacitor which is connected to

Output-pin.

In Power ON state, Soft-Start Time is 5ms (typ.)

5 V

Vin

0 V

2.5 ms min. 12 ms max.

5 V

OUT

0 V

10 s max.

Data Sheet S13020EJ1V0DS00

OPERATING SEQUENCE

Power On/Power Off

5 V

µµµµ

PD16855

IN (input)

OUT

(output)

Flg

(output)

PD16855A/C

CTL

(input)

PD16855B/D

Iout

If CTL-pin is active level after IC is powered on, This IC's Output is started Soft-Start Operation

Note

GND

5 V

GND

5 V

GND

5 V

GND

5 V

GND

over current detect threshold

(Output Transition Rising Time : 12ms max.). When Power-voltage is less than UVLO operating voltage, FLG-pin is fixed on Low-Level. If CTL1 and CTL2 pins are non-active level, this IC moves to Stand-by mode (I

= 5 µA max.)

Input controlled-signal

IN (input)

OUT

(output)

Flg

(output)

CTL

(input)

5 V

GND

5 V

GND

5 V

GND

5 V

PD16855A/C

GND

5 V

PD16855B/D

GND

Data Sheet S13020EJ1V0DS00

Over current detect

PD16855A/B

IN (input)

Flg

(output)

PD16855A

CTL

(input)

PD16855B

OUT

(output)

5 V

GND

5 V

GND

5 V

GND GND

5 V

GND

µµµµ

PD16855

PD16855C/D

Iout

IN (input)

Flg

(output)

PD16855C

CTL

(input)

PD16855D

OUT

(output)

Iout

over current detect threshold

over current detect

5 V

GND

5 V

GND

5 V

GND

5 V

GND

5 V

GND

over current detect threshold

over current detect

If Over current detect circuit is operated, FLG-pin is Low-Level and over current limit circuit is operated. At

Note

this time, output's operation is as followed.

PD16855A/B : output is OFF and Flg-pin is High-Level when CTL-pin is non-active level.

PD16855C/D : output synchronizes in Flg-pin = “L”, and is OFF.

Flg-pin is High-Level when CTL-pin is non-active level. And then when CTL-pin turns to active level again, if UVLO and TSD are not operated, Output-pin is reset to ON-state.

Data Sheet S13020EJ1V0DS00

Thermal shutdown

IN (input)

OUT

(output)

Flg

(output)

PD16855A/C

CTL

(input)

PD16855B/D

5 V

GND

5 V

GND

5 V

GND

5 V

GND

5 V

GND

not Stand-by

Stand-by

µµµµ

PD16855

Tch

In operating the thermal shutdown, the status of output-pin is OFF.

Note

Thermal shutdown

operating temperature (up)

Thermal shutdown

operating temperature (down)

In this case, however, if CTL-pin is kept non-active level, this IC isn’t in stand-by mode. And, thermal shutdown circuit can not be operated in both CTL1-pin and CTL2-pin are non-active level (equal to stand-by mode), if junction-temperature of this IC exceed 150 degree (typ.).

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

CHARACTERISTICS CURVES (unless otherwise specified, TA = 25

PT - TA Rating

500

400

(mW)

300

200

100

Total Power Dissipation P

RON - TA Characteristics

140 120

(Ω)

100

80 60 40

On Resistance R

−20 0 20 40 60 80 Ambient Temperature T

DIP

SOP

−40 0 40 80 120 160 200

Note

(°C)

Ambient Temperature T

(°C)

RON - VIN Characteristics

140 120

(Ω)

100

80 60 40

On Resistance R

3.5 4 4.5 5 5.5 6 Ambient Temperature V

C, VIN = 5 V) (Nominal)

°°°°

Note

(V)

IDD - TA Characteristics

1.0

(mA)

0.8

0.6

0.4

0.2

Current Consumption I

0.0

−20 0 20 40 60 80

Ambient Temperature T

DD STB

- TA Characteristics

0.10

( A)

0.08

DD STB

0.06

0.04

0.02

Current Consumption I

0.00

−20 0 20 40 60 80 Ambient Temperature T

–TA Characteristics and RON – VIN Characteristics show the characteristics for SOP Package.

Note

(°C)

IDD - VIN Characteristics

1.0

(mA)

0.8

0.6

0.4

0.2

Current Consumption I

0.0

3.5 4 4.5 5 5.5 6

Power Supply V

DD STB

- VIN Characteristics

0.10

( A)

0.08

DD STB

0.06

0.04

0.02

Current Consumption I

0.00

3.5 4 4.5 5 5.5 6 Power Supply V

(V)

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

CHARACTERISTICS CURVES (unless otherwise specified, TA = 25

VIL - TA Characteristics

3.0

(V)

2.5

2.0

1.5

1.0

0.5

Low Level Input Voltage V

0.0

−20 0 20 40 60 80

Ambient Temperature T

(°C)

VIH - TA Characteristics

3.0

(V)

2.5

2.0

1.5

3.0

(V)

2.5

2.0

1.5

1.0

0.5

Low Level Input Voltage V

0.0

3.5 4.0 4.5 5.0 5.5 6.0

3.0

(V)

2.5

2.0

1.5

C, VIN = 5 V) (Nominal)

°°°°

VIL - VIN Characteristics

Power Supply V

(V)

VIH - VIN Characteristics

1.0

0.5

High Level Input Voltage V

0.0

−20 0 20 40 60 80

Ambient Temperature T

(°C)

ITH - TA Characteristics

(A)

1.2

1.1

1.0

0.9

0.8

0.7

0.6

Over Current Detect Curent I

−20 0 20 40 60 80

Ambient Temperature T

(°C)

1.0

0.5

Low Level Input Voltage V

0.0

3.5 4.0 4.5 5.0 5.5 6.0

Power Supply V

(V)

ITH - VIN Characteristics

(A)

1.2

1.1

1.0

0.9

0.8

0.7

0.6

Over Current Detect Curent I

3.5 4.0 4.5 5.0 5.5 6.0

Power Supply V

(V)

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

CHARACTERISTICS CURVES (unless otherwise specified, TA = 25

Output Transition Rising Time

Voltage (V)

4.0

(V)

3.8

UVLO

3.6

Input Voltage

Output Voltage

21043

Time (ms)

UVLO circuit operating voltage Characteristics

UVLO(L→H)

Voltage (V)

C, VIN = 5 V) (Nominal)

°°°°

Output Transition Falling Time

Output Voltage

0.40 1.20.8

Time ( s)

3.4

3.2

UVLO Operating Voltage V

3.0

−200 20406080 Ambient Temperature T

UVLO(H→L)

(°C)

Data Sheet S13020EJ1V0DS00

MEASUREMENT CIRCUIT

10 kΩ 10 kΩ

5 V

µµµµ

PD16855

CTL1 OUT1

FLG1 IN

FLG2 GND

CTL2 OUT2

PD16855

1 F

10 Ω

Data Sheet S13020EJ1V0DS00

APPLICATION CIRCUIT

Example 1

Over Current

Enable

USB

Controller

Example 2

Enable

USB

Controller

Timing chart Example 2

D+ D−

Over Current

5 V

10 kΩ

OUT1

CTL1 FLG1 FLG2 CTL2

PD16855A

GND

OUT2

1 F

150 F

USB OUTPUT Port : 1 port

Use PD16855A Not need to control by USB-controller (CTL-input is "H"-active)

5 V3.3 V

10 kΩ10 kΩ

CTL1

OUT1 FLG1 FLG2 CTL2

OUT2

PD16855B

GND

1 F

150 F

USB

Connector

USB OUTPUT Port : 2 port

Use PD16855B controllable by USB-controller (CTL-input is "L"-active)

BUS

D+ D− GND

BUS

V D+ D− GND

BUS

D+ D− GND

µµµµ

PD16855

5 V

IN (input)

OUT

(output)

Flg

(output)

CTL

(input)

Iout

GND

5 V

GND

5 V

GND

5 V

GND

over current detect threshold

over current detect

The application circuits and their parameters are for references only and are not intended for use in actual designin's.

Data Sheet S13020EJ1V0DS00

APPLICATION CIRCUIT

Example 3

Over Current

USB

Controller

Example 4

Controller

Timing chart Example 4

IN (input)

OUT

(output)

D+ D−

Over Current

USB

10 kΩ

OUT1

CTL1

FLG1

GND

FLG2

OUT2

CTL2

PD16855C

USB OUTPUT Port : 1 port

Use PD16855C controllable by USB-controller

D+ D−

10 kΩ10 kΩ

CTL1

OUT1 FLG1 FLG2 CTL2

USB OUTPUT Port : 2 port

Use PD16855D Not need to control by USB-controller

GND

OUT2

PD16855D

5 V

GND

5 V

GND

5 V

1 F

5 V3.3 V

1 F

150 F

V D+ D− GND

USB

Connector

BUS

D+ D− GND

BUS

µµµµ

PD16855

Flg

5 V

(output)

GND

5 V

CTL

(input)

Iout

GND

over current detect threshold

over current detect

The application circuits and their parameters are for references only and are not intended for use in actual designin's.

Data Sheet S13020EJ1V0DS00

PACKAGE DRAWING

8 PIN PLASTIC DIP (300 mil)

µµµµ

PD16855

4.31 MAX.

5.08 MAX.

0.51 MIN.

3.2 ± 0.3

10.16 MAX.

1.4 MIN.

0.50 ± 0.10

0.9 MIN.

2.54

1.27 MAX.

0.25

+0.10 D0.05

7.62

6.4

0~15°0.25

Data Sheet S13020EJ1V0DS00

8 PIN PLASTIC SOP (225 mil)

µµµµ

PD16855

1.44

1.8 MAX

5.37 MAX.

0.78 MAX.

1.27

0.05 MIN.

0.40

+0.10

−0.05

0.12

+0.10

0.15

−0.05

0.5±0.2

6.0±0.3

4.4

0.8

0.10

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

RECOMMENDED SOLDERING CONDITIONS

Soldering the µPD16855 under the conditions listed in the table below is recommended. For soldering methods and conditions other than those recommended, consult NEC.

Surface Mount Type

For the details of the recommended soldering conditions of the surface mount type, refer to information document

“Semiconductor Device Mounting Technology MANUAL” (C10535E)

PD16855AG,

µµµµ

Soldering process Soldering conditions Symbol

Infrared ray reflow Package peak temperature : 235 °C, Time : 30 seconds M A X.(210 °C MIN.),

VPS Package peak temperature : 215 °C , Time : 40 seconds M AX.(200 °C MIN.),

Wave soldering Soldering bath temperature : 260 °C MAX. , Tim e : 10 seconds MAX., Num ber

Partial heating method

PD16855BG,

µµµµ

Number of times : 2 , Number of days : not limited*

of times : 1 , Number of days : not limited* Pin temperature : 300 °C MAX. (lead temperature), Time : 3 sec onds MAX. (per

lead pin), Number of days : not l i m i ted*

PD16855CG,

µµµµ

PD16855DG

µµµµ

IR35-00-2

VP15-00-2

WS60-00-1

* The number of days the devices can be stored at 25 °C, 65 % RH MAX. after the dry pack has been opened.

Caution Do not use two or more soldering methods in condition(except the pin partial heating method).

Throught-hole Type

PD16855BC

µµµµ

Soldering process Soldering conditions Symbol

Wave soldering Soldering bath temperature : 260 °C MAX., Tim e : 10 seconds MAX.

REFERENCE

Document Name Document No. NEC semiconductor device reliability/quality control system IEI-1212 Quality grade on NEC semiconductor devices C11531E Semiconductor device mounting technology manual C10535E NEC IC Package Manual (CD-ROM) C13388E Guide to quality assurance for semiconductor devices MEI-1202 Semiconductor selection guide X10679E

Data Sheet S13020EJ1V0DS00

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.

µµµµ

PD16855

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 device 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 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.

or GND with a

3 STATUS BEFORE INITIALIZATION OF MOS DEVICES

Note: Power-on does not necessarily define initial status of MOS device. Produc-

tion 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 S13020EJ1V0DS00

[MEMO]

µµµµ

PD16855

Data Sheet S13020EJ1V0DS00

[MEMO]

µµµµ

PD16855

Data Sheet S13020EJ1V0DS00

[MEMO]

µµµµ

PD16855

Data Sheet S13020EJ1V0DS00

µµµµ

PD16855

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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 the customer's equipment shall be done under the full responsibility of the customer. NEC Corporation assumes no responsibility for any losses incurred by the customer or third parties arising from the use of these circuits, software, and information.

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M7 98. 8

NEC PD16855A, PD16855B, PD16855C, PD16855D Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual