LT1332_技术文档

LT1332

Wide Supply Range

Low Power RS232 Transceiver with

12V VPP Output for Flash Memory

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DESCRIPTIO

EATURE

S

F

■

Generates Full RS232 Signal Levels from 3V Supply

12V VPP Output Available for Flash Memory

Useful with a Wide Variety of Switching Regulators

Low Supply Current: I(V_CC) = 1mA

Wide Supply Range: 2V ≤ V_CC≤ 6V

ESD Protection Over ±10kV

Operates to 120k Baud

Outputs Assume a High Impedance State When Off

or Powered Down

TheLT1332isa3-driver/5-receiverRS232transceiver,

designed to be used in conjunction with a switching

regulator. The LT1332 shares the regulator’s positive

output, while charge is capacitively pumped from the

regulator’s switch pin to the negative supply. Schottky

rectifiers built into the LT1332 simplify the charge

pump design.

The LT1332/LT1109A combination shown below gener-

atesfullycompliantRS232signallevelsfromaslittleas2V

of input supply. The switcher can deliver greater than

100mA of output current, making the LT1332 an excellent

choice for mouse driver circuits.

■

One µPower Receiver Remains Active While in

SHUTDOWN

■

Flowthrough Architecture Eases PC Board Layout

40µA Supply Current in SHUTDOWN

Absolutely No Latch-Up

Advanced driver output stages operate up to 120k baud

while driving heavy capacitive loads. New ESD structures

on chip make the LT1332 resilient to multiple ±10kV

strikes, eliminating costly transient suppressors.

Available in SO and SSOP Packages

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PPLICATI

S

A

■

A shutdown pin disables the transceiver except for one

receiver which remains active for detecting incoming

RS232 signals. When shut down, the disabled drivers and

receivers assume high impedance output states.

Notebook and Palmtop Computers

Mouse Driver Circuits

■

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TYPICAL APPLICATI

LT1332 Powered from an LT1109A Micropower Switching Regulator

Configured for Flash Memory

Output Waveforms

STANDARD FLASH MEMORY VPP GENERATOR

+

12V VPP

1µF

DRIVER

INPUT

L1**

33µH

OUTPUT

MBRS130T3

SWITCHER

2 AA

BATTERIES

UP TO 6V

–

+

1

2

24

23

22

21

20

19

18

17

16

15

14

13

V

C

V

IN

–

10µF

+

22µF*

DRIVER

OUTPUT

22µF*

V

SW

LT1109A-12

IN

3

R

_L= 3k

4

SW

ON/OFF

C

_L= 2500pF

SENSE

ON/OFF

5

6

LOGIC

SIDE

RS232

SIDE

GND

PGND

7

RECEIVER

OUTPUT

_L= 50pF

8

* AVX TAJE226K035

** SUMIDA CD54-330N (708-956-0666)

C

9

LT1332 • TA02

10

11

12

RS232

ON/OFF

NC

LT1332

3V

RS232

V

CC

0.1µF

LT1332 • TA01

1

LT1332

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ABSOLUTE AXI U RATI GS

(Note 1)

Short Circuit Duration

Supply Voltage (V_CC) ................................................ 6V

V⁺........................................................................ 13.2V

V ^–...................................................................... –13.2V

C^–......................................................................... –15V

Input Voltage

V⁺................................................................... 30 sec

V^–................................................................... 30 sec

Driver Output.............................................. Indefinite

Receiver Output .......................................... Indefinite

Operating Temperature Range .................... 0°C to 70°C

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

Driver .......................................................... V⁺to V^–

Receiver ................................................ 30V to –30V

Output Voltage

Driver .................................................... 30V to –30V

Receiver .................................... –0.3V to V_CC+ 0.3V

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PACKAGE RDER I FOR ATIO

TOP VIEW

NC

1

2

3

4

5

6

7

8

9

28 NC

TOP VIEW

NC

1

2

3

4

5

6

7

8

9

28 NC

–

27 NC

–

+

–

V

27

V

C

1

2

V

24

23

22

21

20

19

18

17

16

15

14

13

+

–

V

26

V

C

26 GND

GND

–

C

25 GND

DRIVER OUT

RX IN

25 DRIVER IN

24 RX OUT

23 DRIVER IN

22 RX OUT

21 RX OUT

20 RX OUT

19 DRIVER IN

18 RXA OUT

17 RS232 ON/OFF

16 GND

DRIVER OUT

RX IN

3

DRIVER IN

RX OUT

DRIVER OUT

RX IN

24 DRIVER IN

23 RX OUT

22 DRIVER IN

21 RX OUT

20 RX OUT

19 RX OUT

18 DRIVER IN

17 RXA OUT

16 RS232 ON/OFF

15 GND

4

DRIVER OUT

RX IN

DRIVER OUT

RX IN

5

DRIVER IN

RX OUT

DRIVER OUT

RX IN

6

RX IN

7

RX OUT

RX IN

8

RX OUT

RX IN

DRIVER OUT 10

RXA IN 11

NC 12

DRIVER OUT

RXA IN

9

DRIVER IN

RXA OUT

RS232 ON/OFF

GND

RX IN 10

DRIVER OUT 11

RXA IN 12

10

11

12

NC

3V V

13

NC 14

3V V

CC

NC 13

15 NC

3V V

14

S PACKAGE

24-LEAD PLASTIC SOL

CC

N PACKAGE

G PACKAGE

28-LEAD SSOP

28-LEAD PLASTIC DIP

T_JMAX= 150°C, θ_JA= 80°C/W

T_JMAX= 150°C, θ_JA= 56°C/W

T_JMAX= 150°C, θ_JA= 96°C/W

ORDER PART NUMBER

LT1332CG

ORDER PART NUMBER

LT1332CN

ORDER PART NUMBER

LT1332CS

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS ^{(Note 2)}

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Supply

Supply Current I(V )

+

(Note 3)

(Note 4)

0.3

–0.6

1.0

0.04

0.8

–1.0

1.5

0.10

0.07

mA

–

Supply Current I(V

Supply Current When OFF I(V

)

CC

)

●

CC

+

Supply Current When OFF I(V )

V

= 3V, V = 8V, V

= 3V, V = –8V, V

= 0.1V

ON/OFF

0.10

0.20

mA

CC

–

= 0.1V

CC

ON/OFF

2

LT1332

ELECTRICAL CHARACTERISTICS ^{(Note 2)}

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Supply

ON/OFF Pin Thresholds

Input Low Level (Device Shut Down)

Input High Level (Device Enabled)

●

0.7

0.6

0.3

80

V

µA

1.3

–15

ON/OFF Pin Current

Drivers

0V ≤ V

≤ 5V

●

ON/OFF

Output Voltage Swing

R = 3k to GND

Positive

Negative

●

5.0

2.0

6.6

–7.0

1.4

V

L

–5.0

0.8

Logic Input Voltage Level

Input Low Level (V

Input High Level (V

= High)

●

OUT

= Low)

OUT

Logic Input Current

Output Short-Circuit Current

Output Leakage Current

Driver Output ESD Rating

Slew Rate

0.8V ≤ V ≤ 2.0V

●

5

±17

10

±10

15

6

20

100

30

µA

mA

µA

kV

V/µs

IN

V

OUT

= 0V

SHUTDOWN V

= ±30V, V

= 0.1V

●

OUT

ON/OFF

Human Body Model Discharge

R = 3k, C = 51pF

L

R = 3k, C = 2500pF

4

L

Propagation Delay

Output Transition t

High to Low (Note 5)

Low to High

0.6

0.5

1.3

µs

PHL

PLH

Receivers

Input Voltage Thresholds

Input Low Threshold (V

Input High Threshold (V

= High)

= Low)

0.8

1.3

1.7

0.4

5

±10

0.2

2.9

1

–4

4

V

kΩ

kV

V

µA

OUT

2.4

1.0

7

OUT

Hysteresis

●

0.1

3

Input Resistance

Receiver Input ESD Rating

Output Voltage

Human Body Model Discharge

Output Low, I = –500µA

●

0.4

OUT

Output High, I

= 100µA (V = 3V)

2.7

2

OUT

CC

Output Leakage Current

Output Short-Circuit Current

SHUTDOWN (Note 6) 0 ≤ V

≤ V

●

10

–2

OUT

CC

Sinking Current, V

= V

mA

OUT

CC

= 0V

Sourcing Current, V

OUT

Propagation Delay

Output Transition t High to Low (Note 7)

1

0.6

3

µs

HL

Output Transition t Low to High

LH

The

●

denotes specifications which apply over the full operating

Note 5: For driver delay measurements, R = 3k and C = 51pF. Trigger

L L

temperature range.

Note 1: Absolute maximum ratings are those values beyond which the life

points are set between the driver’s input logic threshold and the output

transition to the zero crossing (t = 1.4V to 0V and t = 1.4V to 0V).

PHL

PLH

of the device may be impaired.

Note 6: Receiver RXA (Pins 10 and 15, S Package) remains functioning in

SHUTDOWN.

+

–

Note 2: Testing is done at V = 3V, V = 8V, V = –8V, and

CC

V

= 3V.

Note 7: For receiver delay measurements, C = 51pF. Trigger points are

set between the receiver’s input logic threshold and the output transition

ON/OFF

L

Note 3: Supply current is measured with all driver inputs tied high.

Note 4: Supply current measurements in SHUTDOWN are performed with

to standard TTL/CMOS logic threshold (t = 1.3V to 2.4V and t = 1.7V

LH

HL

to 0.8V).

+

–

V

= 0.1V, V = 0V, V = 0V.

ON/OFF

3

LT1332

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TYPICAL PERFOR A CE CHARACTERISTICS

Unloaded Supply Current

vs Temperature

Supply Current vs Data Rate

ON/OFF Threshold vs Temperature

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

16

14

12

10

8

1.6

R

C

= 3k

L

= 2500pF

1.4

1.2

ALL DRIVERS LOADED

–

I(V )

DRIVER OUTPUTS HIGH

–

I(V )

1.0

0.8

0.6

0.4

0.2

+

I(V

)

I(V )

CC

+

I(V )

6

DRIVER OUTPUTS LOW

4

2

I(V

)

CC

0

–50

50

100 125

150

–25

0

25

75

–25

0

50

75 100 125

–50

25

0

20 40 60 80 100 120 140 160 180 200

DATA RATE (k BAUD)

TEMPERATURE (°C)

TEMPERATURE (˚C)

LT1332 • TPC03

LT1332 • TPC01

LT1332 • TPC02

Leakage Current in Shutdown

vs Temperature

Driver Short-Circuit Current

vs Temperature

Driver Leakage in Shutdown

vs Temperature

150

125

100

75

100

10

1

30

25

20

15

10

5

+

I(V ) = 8V

+

I

SC

–

I(V ) = – 8V

V

= 30V

OUT

–

V

= –30V

OUT

50

25

0

I(V ) = 3V

CC

0

0.1

–50 –25

75 100

TEMPERATURE (°C)

–50 –25

0

25 50

125 150

50

TEMPERATURE (˚C)

100 125

0

25

50

75 100 125

–50 –25

0

25

75

TEMPERATURE (°C)

LT1332 • TPC05

LT1332 • TPC06

LT1027 • TPC04

Driver Output Voltage

vs Temperature

Receiver Short-Circuit Current

vs Temperature

Slew Rate vs Load Capacitance

15

14

13

12

11

10

9

30

25

20

15

10

5

8

6

R

L

= 3k

–

INPUT LOW

+

SR

V

= 8V

–

= –8V

= 3V

4

CC

–

I

2

SC

0

–2

–4

–6

–8

8

+

7

I

SC

+

SR

6

5

INPUT HIGH

50 75

4

0

500 1000 1500 2000 2500 3000

CAPACITANCE (pF)

75 100

–50 –25

0

25 50

125 150

–50 –25

0

25

100 125 150

TEMPERATURE (°C)

LT1332 • TPC07

LT1332 • TPC09

LT1332 • TPC08

4

LT1332

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TYPICAL PERFOR A CE CHARACTERISTICS

Receiver Input Thresholds

Receiver Output Voltage

vs Supply Voltage

vs Temperature

vs Supply Voltage

5

0.6

0.5

0.4

0.3

0.2

0.1

0

2.5

2.0

1.5

1.0

0.5

0

V

= 3V

CC

RECEIVER

OUTPUT LOW

SINKING 500µA

4

3

V

HIGH

TH

V

HIGH

LOW

TH

RECEIVER

OUTPUT LOW

SINKING 250µA

V

LOW

TH

RECEIVER

OUTPUT HIGH

2

1

0

(V – V

)

CC

OUT

V

TH

SOURCING

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

SUPPLY VOLTAGE (V)

4.0

SUPPLY VOLTAGE (V)

50

25

TEMPERATURE (°C)

2.0 2.5 3.0 3.5

4.5 5.0 5.5 6.0

–50 –25

0

75 100 125 150

LT1332 • TPC12

LT1332 • TPC10

LT1332 • TPC11

Receiver Output Waveforms

Driver Output Waveforms

INPUT

5V/DIV

INPUT

5V/DIV

DRIVER

OUTPUT

R

_L= 3k

C

_L= 2500pF

10V/DIV

RX OUTPUT

C

_L= 50pF

2V/DIV

DRIVER

OUTPUT

R_L= 3k

10V/DIV

LT1332 • TPC13

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PI FU CTIO S

+

V_CC: Input Supply Pin. V_CCcan vary from 2V to 6V to

accommodate a wide range of logic levels, yet the system

still responds correctly to RS232 signals. Supply current

drops to 40µA in the SHUTDOWN mode. This pin should

be decoupled with a 0.1µF ceramic capacitor.

V⁺: Positive Supply Input (RS232 Drivers). V should

be greater than 6.5V and less than 13.2V to assure valid

RS232 output signals. An additional decoupling ca-

+

pacitormayberequirediftheV generatorislocatedfar

away from the LT1332.

GND: Ground Pins. Pins 13 and 23 (S Package) must both

be grounded for proper operation.

V^–: Negative Supply Pin (RS232 Drivers). This pin re-

quires an external capacitor. When the device is powered

from a switching regulator, the filter capacitor should be

selected based on the maximum tolerable ripple for the

specified minimum regulator on time. For some low

frequency Burst Mode^TMregulators, the filter capacitor

should be relatively large (C ≥ 10µF). Low ESR tantalum

ON/OFF:Controlstheoperationmodeofthedeviceand

is CMOS compatible. A logic low puts the device in the

SHUTDOWN mode which reduces input supply current

to 40µA and places all of the drivers and four of the

receivers in a high impedance state. A logic high fully

enables the device.

Burst Mode^TMis a trademark of Linear Technology Corporation

5

LT1332

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PI FU CTIO S

capacitors work well in this application. When V^–is

powered from an external supply, the filter capacitor can

be considerably smaller (C ≥ 0.1µF). Ceramic capacitors

work well under these conditions. V^–should be greater

than –13.2V and less than –6.5V.

C^–: Commutating Capacitor Input. When the LT1332 is

used with a switching regulator, a charge pump capacitor

shouldbeconnectedfromtheregulator’sswitchpintothe

C^–pin. Make the external capacitor 1µF or larger with low

effective series resistance to maintain good charge pump

efficiency. Low ESR tantalum capacitors (ESR < 2Ω) work

well in this application. The C^–pin should be left open

when V^–is powered from an external supply.

can load the power supply generator and may disrupt

thesignallevelsoftheotheroutputs.Thedriveroutputs

are protected against ESD to ±10kV for human body

model discharges.

RX IN: Receiver Inputs. These pins accept RS232 level

signals (±5V to ±30V) into a protected 5k terminating

resistor. The receiver inputs are protected against ESD to

±10kV for human body model discharges. Each receiver

provides 0.4V of hysteresis for noise immunity. The re-

ceiver thresholds are specified at V_CC= 3V. When V_CC

varies from 2V to 6V, the lower threshold increases

about3V. Regardlessoftheseshifts, thedeviceprovides

accurate data from valid RS232 input signals. A graph in

the performance characteristics section shows typical

changesinthethresholds.Theactivereceiver(RXA, Pin

10, S Package) remains functional in SHUTDOWN.

DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/

CMOS compatible, with threshold set to 1.2V. Unused

inputs should not float; tie them to V .

CC

RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-

els. Outputs are in a high impedance stage when in

SHUTDOWN mode to allow data line sharing. Outputs are

fully short-circuit protected to ground or V_CCwith the

power on, off or in SHUTDOWN mode. The active receiver

(RXA, Pin 15, S Package) remains functional in SHUT-

DOWN.

DRIVER OUT: Driver Outputs at RS232 Voltage Levels.

Outputs are in a high impedance state when in SHUT-

DOWN mode, or V_CC= 0V. Outputs are fully short-circuit

protected from V^–+ 30V to V⁺– 30V with the power on,

off or SHUTDOWN. Typical breakdowns are ±45V.

Applying higher voltages will not damage the device if

the overdrive is moderately current limited. Although

the outputs are protected, short circuits on one output

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ESD PROTECTIO

ESD Test Circuit

The RS232 line inputs of the LT1332 have on-chip protec-

tion from ESD transients up to ±10kV. The protection

structures act to divert the static discharge safely to

systemground. InorderfortheESDprotectiontofunction

effectively, the power supply and ground pins of the

LT1332 must be connected to ground through low imped-

ances.Thepowersupplydecouplingcapacitorsandcharge

pump storage capacitors provide this low impedance in

normal applications of the circuit. The only constraint is

that low ESR capacitors must be used for bypassing and

charge storage. ESD testing must be done with pins V_CC,

V⁺, V^–and GND shorted to ground or connected with low

ESR capacitors.

+

–

V

C

1

2

24

V

–12V

0.1µF

12V

23 GND

22

0.1µF

3

DRIVER IN

DRIVER OUT

RX IN

4

21

20

19

18

17

16

15

14

13

RX OUT

5

DRIVER IN

RX OUT

DRIVER OUT

RX IN

6

RS232

LINE PINS

PROTECTED

TO ±10kV

7

RX OUT

RX IN

8

RX OUT

RX IN

9

DRIVER IN

RXA OUT

RS232 ON/OFF

GND

DRIVER OUT

RXA IN

10

11

12

NC

CC

LT1332

3V V

3V

0.1µF

LT1332 • TC

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LT1332

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APPLICATIO S I FOR ATIO

Operation with a Switching Regulator

tors should be used in the charge pump to reduce voltage

losses. The C^–capacitor should be at least 1µF and the V^–

capacitor should be 5 to 10 times bigger. As a rule of

thumb, make the V^–capacitor at least 1/DC_MINtimes

biggerthantheC^–capacitorwhereDC_MINistheregulator’s

minimum duty cycle. Using large values for the V^–capaci-

tor reduces ripple on the V^–supply.

The LT1332 is designed to be powered from an external

switching regulator which may be used elsewhere for

power conditioning. In a typical application, the LT1332

shares the regulator’s positive output, while charge is

capacitively pumped from the regulator’s switch pin to the

negative supply. Schottky rectifiers built into the LT1332

simplify the charge pump design. When used with a

micropower switcher like the LT1109A, the Burst Mode^TM

operation of the charge pump resembles the switching

characteristics of the LT1237 and similar devices.

The V^–supply is not directly regulated. The circuit relies

on cross regulation and the regulator’s minimum duty

cycle to control V^–. Select the C^–and V^–storage capaci-

tors so that when the regulator operates at minimum duty

cycle, sufficient charge will transfer to the V^–storage cap

to maintain a voltage of at least –6.5V.

Multiple Transceivers

The circuit in Figure 1 demonstrates how the LT1332 may

be used with different types of switching regulators. Four

LT1332s are powered from a single PWM DC/DC con-

verter using an LT1172. Even with all twelve drivers

heavilyloaded(R_L=3k,C_L=2500pF),thecircuitgenerates

fully compliant RS232 signals at 120k baud.

Operations with External Supplies

When external RS232 supplies are available (6.5V ≤ V⁺

≤ 13.2V, –13.2V ≤ V ^–≤ –6.2V) the LT1332 can be used

as a stand-alone unit. Capacitor selection is consider-

Whileonly0.1µFceramicdecouplingcapacitorsareneeded

on the positive supply inputs, low ESR tantalum capaci-

+

1µF

+

–

+

–

+

–

+

–

V

C

V

C

V

C

V

C

V

0.1µF

10µF 0.1µF

10µF

+

LT1332

GND

ON/OFF

GND

ON/OFF

GND

ON/OFF

GND

ON/OFF

GND

CC

3V V

CC

3V V

CC

INPUT

0.1µF

ON/OFF

*

**

L1 = SUMIDA CD105-101K OR COILCRAFT DO3316-104

1% METAL FILM

2.7V < V < 5.5V

IN

L1*

100µH

I(V ) < 14mA (UNLOADED)

IN

8V

1N5817

V

IN

+

68µF

22µF

V

IN

V

SW

135k**

LT1172

FB

GND

V

C

25k**

1k

0.1µF

OPTIONAL

SHUTDOWN

VN2222LL

LT1332 • F01

Figure 1. Multiple LT1332s Powered from a Single LT1172 DC/DC Converter

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

7

LT1332

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APPLICATIO S I FOR ATIO

ably simpler. Decouple V⁺and V^–with 0.1µF ceramic

entersmicropower shutdownmodein which thecurrent

drawn from V_CCdrops to typically 40µA. If the power

applied to V⁺and V^–remains on in shutdown, there will

be approximately 100µA of leakage from each supply. If

these supplies drop to zero, leakage current also drops

to zero. In shutdown mode one receiver remains active

whichmaybeusefulfordetectingstart-upsignalsforthe

transceiver.

capacitors.

Shutdown Control

TheLT1332hasanON/OFFpinthatcontrolsthedevice’s

mode of operation. With the ON/OFF pin high and the

device operated unloaded, the LT1332 draws 1mA of

supply current. With the ON/OFF pin low, the device

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PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

G Package

28-Lead Plastic SSOP

0.397 – 0.407*

(10.07 – 10.33)

0.205 – 0.212*

(5.20 – 5.38)

0.068 – 0.078

(1.73 – 1.99)

28 27 26 25 24 23 22 21 20 19 18

16 15

17

0° – 8°

0.301 – 0.311

(7.65 – 7.90)

0.045

(1.14)

0.0256

(0.65)

BSC

0.022 – 0.037

0.005 – 0.009

(0.55 – 0.95)

(0.13 – 0.22)

0.002 – 0.008

(0.05 – 0.21)

0.010 – 0.015

(0.25 – 0.38)

5

7

8

1

2

3

4

6

9

10 11 12 13 14

0.045

(1.14)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).

N Package

28-Lead Plastic DIP

1.455

(36.957)

MAX

0.070

(1.778)

TYP

0.600 – 0.625

(15.240 – 15.875)

0.130 ± 0.005

(3.302 ± 0.127)

0.045 – 0.065

(1.143 – 1.651)

28 27 26 25 24 23 22 21 20 19 18 17 16 15

0.015

(0.381)

MIN

0.505 – 0.560

(12.827 – 14.224)

0.009 – 0.015

(0.229 – 0.381)

+0.025

0.035 – 0.080

(0.889 – 2.032)

0.125

(3.175)

MIN

0.625

0.018 ± 0.003

(0.457 ± 0.076)

–0.015

+0.635

15.87

1

2

3

4

5

6

7

8

9

10 11 12 13 14

0.100 ± 0.010

(2.540 ± 0.254)

(

)

–0.381

S Package

24-Lead Plastic SOL

0.291 – 0.299

(7.391 – 7.595)

(NOTE 2)

0.598 – 0.614

(15.190 – 15.600)

(NOTE 2)

0.037 – 0.045

(0.940 – 1.143)

0.093 – 0.104

(2.362 – 2.642)

24 23 22 21 20 19 18

16 15 14 13

17

0.005

(0.127)

RAD MIN

0.010 – 0.029

(0.254 – 0.737)

× 45°

0° – 8° TYP

0.050

(1.270)

TYP

0.394 – 0.419

(10.007 – 10.643)

NOTE 1

0.004 – 0.012

(0.102 – 0.305)

0.009 – 0.013

(0.229 – 0.330)

NOTE 1

0.014 – 0.019

(0.356 – 0.482)

0.016 – 0.050

(0.406 – 1.270)

NOTE:

1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.

2

3

5

7

8

9

10

1

4

6

11 12

2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).

LT/GP 1193 10K REV 0 • PRINTED IN USA

LINEAR TECHNOLOGY CORPORATION 1993

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

8

●

(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977


型号：	LT1332
厂家：	Linear
描述：	Wide Supply Range Low Power RS232 Transceiver with 12V VPP Output for Flash Memory 宽电源电压范围，低功耗的RS232收发器， 12V VPP输出为Flash存储器存储
文件：	总8页 (文件大小：266K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1332 [Linear]

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