SGS Thomson Microelectronics ST1480ACN, ST1480ACDR, ST1480ACD, ST1480ABN, ST1480ABDR Datasheet

1/16October 2002

■ ESD PROTECTION:

±15KV HUMAN BODY MODEL
±8KV IEC 1000-4-2 CONTACT DISCHARGE

■ OPERATE FROM A SINGLE 3.3V SUPPLY-

NO CHARGE PUMP REQUIRED

■ INTEROPERABLEWITH 5 V LOGIC

■ 1µA LOW CURRENT SHUTDOWN MODE

MAX

■ GUARANTEED 12 Mbps DATA R ATE

■ -7 TO 12 COMMON MO DE INPUT VOLTAGE

RANGE

■ HALF DUPLEX VERSIONS AVAILABLE

■ INDUSTRY STANDA RD 75176 PINOUT

■ CURRENT LIMITING AND THERMAL

SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION

■ GUARANTEED HIGH RECEIVER OUTPUT

STATE FOR FLOATING,SHORTED OR
TERMINATED INPUTS WITH NO SIGNAL
PRESENT

■ ALLOW UP TO 64 TRANSCEIVERS ON T HE

BUS

DESCRIPTION

The ST1480A is ±15kV ESD protected, 3.3V low
power transceiver for R S - 485 and RS-422

communications. The device contains one driver
and one receiver in hal f duplex configuration. The
ST1480A transmit and receive at guaranteed data
rate at least to 12Mbps.
All transmitter outputs and receiver inputs are
protected to ±15kV using Human Body Mo del.
Driver is short-circuit current limited and is
protected against excessive p ower dissipation by
thermal shutdown circuitry that place the driver
outputs into a high-impedance state.
The S T1480A input has a t ru e fail-safe feature
that guarantees a logic high output if both inputs
are open circuit, shorted together or in presence of
the termination with no signal on the bus.

ORDERING CODES

Type

Temperature

Range

Package Comments

ST1480ACN 0 to 70 °C DIP-8 50parts per tube / 40tube per box
ST1480ABN -40 to 85 °C DIP-8 50parts per tube / 40tube per box
ST1480ACD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box

ST1480ABD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box
ST1480ACDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel
ST1480ABDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel

ST1480A

3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT
UP T O 12MBPS TRUE RS-485/RS-422 TRANSCEIVER

DIP SOP

ST1480A

2/16

PIN CONFIGURATION

PIN DESCRIPTION

TRUTH TABLE (DRIVE R)

X= Don’t Care; Z=High Impedance

TRUTH TABLE (RECE IVER)

X= Don’t Care; Z=High Impedance

PlN N° SYMBOL NAME AND FUNCTION

1RO

Receiver Output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be
low

2RE

Receiver Output Enable. RO is enabled when RE is low; RO is high impedance
when RE is high. If RE is high and DE is low, the device will enter a low power
shutdown mode.

3DE

Driver Output Enable. The driver outputs are enabled by bringing DE high. They
are high impedance when DE is low. If RE is high DE is low,thedevice will enter a
low-power shutdown mode. If the driver outputs are enabled, the part functions as
line driver, while they are high impedance, it functions as line receivers if RE is
low.

4DI

Driver Input. A low on DI forces output A low and output B high. Similarly, a high

on DI forces output A high and output B low
5 GND Ground
6 A Non-inverting Receiver Input and Non-inverting Driver Output
7 B Inverting Receiver Input and Inverting Driver Output
8

V

CC

Supply Voltage: VCC= 3V to 3.6V

INPUTS OUTPUTS

MODE

RE

DE DI B A

X H H L H Normal
X H L H L Normal
L L X Z Z Normal
H L X Z Z Shutdown

INPUTS OUTPUT

MODE

RE

DE A-B RO

LL ≥ -0.015V H Normal
LL ≤ -0.2V L Normal
L L Inputs Open H Normal
L L Inputs Shorted H Normal

H L X Z Shutdown

ST1480A

3/16

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

ESD PERFORMANCE: TRANSMITTER O UTPUTS, RECEIVER INPUTS

ELECTRICAL CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified. Typical values are referred to TA= 25°C)

LOGIC INPUT EL ECTRICAL CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified. Typical values are referred to TA= 25°C)

Symbol Parameter Value Unit

V

CC

Supply Voltage

7V

V

I

Control Input Voltage (RE,DE)

-0.3 to 7 V

V

DI

Driver Input Voltage (DI)

-0.3 to 7 V

V

DO

Driver Output Voltage (A, B)

-7.5 to 12.5 V

V

RI

Receiver Input Voltage (A, B)

-7.5 to 12.5 V

V

RO

Receiver Output Voltage (RO) -0.3 to (VCC+ 0.3)

V

Symbol Parameter Test Conditions Min. Typ. Max. Unit

ESD ESD Protection Voltage Human Body Model ± 15 KV
ESD ESD Protection Voltage IEC-1000-4-2 Contact Disharge ± 8KV

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

SUPPLYVCC

Power Supply Current No Load, DI=0V or V

CC

DE=VCC,
RE

=0V or V

CC

1.3 2.2 mA

DE=0V,
RE

=0V

1.2 1.9 mA

I

SHDN

Shutdown Supply Current DE=0V, RE=VCC, DI=0V or V

CC

0.002 1 µA

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

IL

Input Logic Threshold Low DE, DI, RE 1.3 0.8 V

V

IH

Input Logic Threshold High DE, DI, RE 2 V

I

IN1

Logic Input Current DE, DI, RE ± 2.0 µA

I

IN2

Input Current (A, B) DE=0V, VCC= 0 or 3.6V VIN=12V 1 mA

V

IN

=-7V 0.8 mA

ST1480A

4/16

TRANSMITTER ELECTRICAL CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified. T yp ical values are r efe rred to Ta=25°C)

RECEIVER ELECTRICAL CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified. T yp ical values are r efe rred to Ta=25°C)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

OD

Differential Drive Output RL= 100Ω (RS-422) (Figure 1) 2 V

R

L

=54Ω(RS-485) (Figure 1) 1.5 V

R

L

=60Ω(RS-485) (Figure 2) 1.5 V

∆V

OD

Change in magnitude of
Driver Differential Output
Voltage for Complementary
Output States (Note1)

R

L

=54Ωor 100Ω (Figure 1) 0.2 V

V

OC

Driver Common Mode
Output Voltage

RL=54Ωor 100Ω (Figure 1) 3 V

∆V

OC

Change in magnitude of
Driver Common Mode
Output Voltage (Note1)

R

L

=54Ωor 100Ω (Figure 1) 0.2 V

I

OSD

Driver Short Circuit Output
Current

± 250 mA

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

TH

Receiver Differential
Threshold Voltage

VCM= -7V to 12V, DE = 0 -0.2 -0.015 V

∆V

TH

Receiver Input Hysteresis VCM=0V 30 V

V

OH

Receiver Output High
Voltage

I

OUT

= -4mA, VID= 200mV, (Figures 8,9) 2 V

V

OL

Receiver Output Low
Voltage

I

OUT

= 4mA, VID= -200mV, (Figure 3) 0.4 V

I

OZR

3-State (High Impedance)
Output Current at Receiver

VCC= 3.6V VO=0VtoV

CC

± 1 µA

R

RIN

Receiver Input Resistance VCM= -7V to 12V 24 KΩ

I

OSR

Receiver Short-Circuit
Current

VRO=0VtoV

CC

760mA

ST1480A

5/16

DRIVER SWITCHING CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified. T yp ical values are r efe rred to Ta=25°C)

RECEIVER SWITCHING CHARACTERISTICS

V

CC

=3Vto3.6V,TA= -40 to 85°C, unless otherwise specified . Typicalvalues are referred toTa= 25°C)

Note 1:∆VODand ∆VOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 2:measuredon |t

PLH

(A)-t

PHL

(A)| and |t

PLH

(B)-t

PHL

(B)|
Note 3: The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80ns, the part are guaren­teed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guarenteed to have entered shutdown.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

D

R

Maximum Data Rate 12 15 Mbps

t

DD

Differential Output Delay RL=60Ω CL= 15pF, (Figures 4,5) 18 30 ns

t

TD

Differential Output
Transition Time

RL=60Ω CL= 15pF, (Figures 4,5) 12 20 ns

t

PLH

t

PHL

Propagation Delay RL=27Ω CL= 15pF, (Figures 8,9) 18 30 ns

t

PDS|tPLH -tPHL

| Propagation

Delay Skew (Note2)

RL=27Ω CL= 15pF, (Figures 8,9) 2 5 ns

t

PZL

Output Enable Time RL=110Ω (Figures 10,11) 19 35 ns

t

PZH

Output Enable Time RL=110Ω (Figures 6,7) 30 50 ns

t

PHZ

Output Disable Time RL=110Ω (Figures 6,7) 19 35 ns

t

PLZ

Output Disable Time RL=110Ω (Figures 10,11) 30 50 ns

t

SKEW

Differential Output Delay
Skew

13ns

t

ZH(SHDN)

Driver Enable from
Shutdown to Output High

30 50 ns

t

ZL(SHDN)

Driver Enable from
Shutdown to Output Low

19 35 ns

Symbol Parameter Test Conditions Min. Typ. Max. Unit

t

PLH

t

PHL

Propagation Delay VID=0Vto3VCL1= 15pF, (Figures 12,13) 30 50 ns

t

RPDS|tPLH -tPHL

| Propagation

Delay Skew

VID=0Vto3VCL1= 15pF, (Figures 12,13) 1 3 ns

t

PZL

Output Enable Time CRL= 15pF (Figures 14-18) 10 20 ns

t

PZH

Output Enable Time CRL= 15pF (Figures 14-18) 10 20 ns

t

PHZ

Output Disable Time CRL= 15pF (Figures 14-18) 10 20 ns

t

PLZ

Output Disable Time CRL= 15pF (Figures 14-18) 10 20 ns

t

ZH(SHDN)

Receiver Enable from
Shutdown to Output High

CRL= 15pF (Figures 14-18) 10 20 ns

t

ZL(SHDN)

Receiver Enable from
Shutdown to Output Low

CRL= 15pF (Figures 14-18) 20 40 ns