Burr Brown ISO508P-U, ISO508P Datasheet

®

ISO508

ISO508

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ISOLATED DIGITAL COUPLERS

ISO508

Uni-Directional

FEATURES

● LOW POWER CONSUMPTION:

< 12mW per Channel Typ.

● 1500Vrms ISOLATION:

100% Tested by Partial Discharge

● ASYNCHRONOUS OR SYNCHRONOUS

OPERATION

● DOUBLE BUFFERED DESIGN FOR

EASY INTEGRATION INTO BUS-BASED
SYSTEMS

● TRI-STATE OUTPUTS

● 24-PIN PDIP OR GULL WING PACKAGES

● 2MWORDS/SEC TRANSFER RATE

● 1µSEC TRANSIENT RECOVERY

APPLICATIONS

● PARALLEL ADCs/DACs

● DIGITAL INTERFACES

● DIGITAL TRANSMISSION

● GROUND-LOOP ISOLATION

DESCRIPTION

ISO508 is an 8-channel, isolated, digital coupler based
on the Burr-Brown capacitive barrier technology. The
ISO508 has additional circuitry to ensure DC accuracy
and overcome the edge-sensitive nature of normal
capacitive devices even on power-up conditions. The
novel circuitry involved will restore the correct output
after a transient interruption should that be necessary.

The ISO508 is designed with input and output
buffers for ease of integration into a µP bus system.
The output buffer has tri-state capability, and by
the use of OE, the output data bus lines can be
made to go high impedance. This feature of the
ISO508, which allows multiple access to a data
bus, requires extra circuitry when using an alterna­tive solution.

ISO508 will transfer an 8-bit word at rates up to
2Mwords/s without the skew problems associated
in implementing this function with optocouplers.
The ISO508 is available in 24-pin PDIP or 24-pin
Gull Wing packages. Both are specified for opera­tion from –40°C to +85°C.

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DATA

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IN

C
H

LEI

CONT

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©

1998 Burr-Brown Corporation PDS-1422B Printed in U.S.A. June, 1999

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DATA

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OUT

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OE
LEO

®

ISO508

SPECIFICATIONS

At TA = +25°C, and VS = +5V, unless otherwise noted.

ISO508P, P-U

PARAMETER CONDITIONS MIN TYP MAX UNITS

ISOLATION

Rated Voltage, Continuous V

ISO

Partial Discharge Voltage 1s, 5x5pC/cycle
Barrier Impedance >1014, 10 ΩpF
Leakage Current 240V, 60Hz 1 µA

Creepage Distance PDIP = “P” Package 11 mm
Internal Isolation Distance PDIP = “P” Package 0.1 mm
Transient Recovery Time 5kV/µs Edge 1 µs

DC CHARACTERISTICS

High Level Input Voltage V
Low Level Input Voltage V
Input Pull-Down Current (Cont, OE) I
Input Leakage Current I
High Z Leakage Current I
Input Capacitance C
High Level Output Voltage V
Low Level Output Voltage V
Output Short-Circuit Current I

IH

IL

PD

L

H

IN

OH

OL

OS

TIMING

LE Width (LOW) t
LE Width (HIGH) t
Data Set-Up to LEI t
Data Hold from LEI t
Propagation Delay t

Data Output Delay t
Output Rise and Fall Time t
Output Enable t
Output Disable t

WL

IL

SU

H

PD

LEO High to Data Out Change 35 ns

DD
OD
OE

DIS

Skew Between any 2 Channels 5 ns
Max Data Transfer Rate (Sync) 2 Mw/s

(Cont) 1 Mw/s

POWER

Supply Voltage V
Supply Current I

Supply Current I

, V

SA

SB
SA

SB

TEMPERATURE RANGE

Operating –40 +85 °C
Storage –40 +125 °C
Thermal Resistance,

θ

JA

NOTES: (1) All devices receive a 1s test. Failure criterion is 5 pulses of ≥ 5pC per cycle. (2) Logic inputs are HCT-type and thresholds are a function of power supply
voltage with approximately 400mV hysteresis.

50Hz, 60Hz 1500 V

(1)

2500 V

2500V, 50Hz 12 µA

See Note 2 2 V
See Note 2 0.8 V

VIN = 5V 5 50 µA

LEI, LEO, D0-7 1 nA

1nA
5pF

VS = 4.4 - 4.5, IOH = 6mA VS – 1 V

IOL = 6mA 0.4 V

1 second, max 30 mA

50 ns

15 ns
LEI HI to LO 0 ns
LEI HI to LO 20 ns

Data In to Data Out (Cont) 1000 ns

LEI LOW to Data Out (Sync) 520 ns

10% to 90%, CL = 50pF 9 14 ns

OE to Data Valid High or Low 35 ns

OE to Data Hi-Z 25 ns

Either Side 4.5 5.5 V

Transmit Side DC 5 10 mA

Transmit Side DC Max Rate 7 15 mA

Receive Side DC 8 12 mA

Receive Side Max Rate 12 20 mA

75 °C/W

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.

®

ISO508

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