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PDF ISO508P-U Data sheet ( Hoja de datos )
| Número de pieza | ISO508P-U | |
| Descripción | Uni-Directional ISOLATED DIGITAL COUPLERS | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISO508P-U (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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®
ISO508
ISO508
For most current data sheet and other product
information, visit www.burr-brown.com
ISO508
Uni-Directional
ISOLATED DIGITAL COUPLERS
FEATURES
q LOW POWER CONSUMPTION:
< 12mW per Channel Typ.
q 1500Vrms ISOLATION:
100% Tested by Partial Discharge
q ASYNCHRONOUS OR SYNCHRONOUS
OPERATION
q DOUBLE BUFFERED DESIGN FOR
EASY INTEGRATION INTO BUS-BASED
SYSTEMS
q TRI-STATE OUTPUTS
q 24-PIN PDIP OR GULL WING PACKAGES
q 2MWORDS/SEC TRANSFER RATE
q 1µSEC TRANSIENT RECOVERY
APPLICATIONS
q PARALLEL ADCs/DACs
q DIGITAL INTERFACES
q DIGITAL TRANSMISSION
q 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 alterna-
tive 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 opera-
tion from –40°C to +85°C.
L LS
AAH
DATA
T
T
I
IN
CCF
HHT
SLL
HAA
I T T DATA
OUT
F CC
T HH
LEI
CONT
OE
LEO
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1998 Burr-Brown Corporation
PDS-11422B
IPSrinOted5in0U8.S.A. June, 1999
®
1 page  
DATA CORRUPTION
In either synchronous or asynchronous mode if the data is
upset by a transient the complete transmission is invalid.
However, in asynchronous mode the data is being sent
continuously and will therefore correct the corrupted infor-
mation within a maximum of 1µs. In synchronous mode,
data transfer is under the control of the user, and retransmis-
sion would be required by the software.
DATA TRANSMISSION AND JITTER
Because the internal 20MHz clock is free-running, two
“jitter” conditions are possible. In synchronous mode when
LEI goes low data will be transmitted (clocked) across the
barrier. Depending on when LEI goes low, in relation to the
internal clock cycle, will determine the “jitter” between
successive input data transfers. This can be maximum of
50ns.
In asynchronous mode the input data is transferred by the
internal clock and logic control, i.e., 2 sync. Clock cycles.,
(S0, and S1), 8 data clock cycles. Depending on when the
input data is presented, in relation to the start of the data
block transmission, will determine the “jitter” between suc-
cessive input data transfers. This can be maximum of 500ns.
INPUT DATA n–1 DATA n DATA n+1
LEI
DATA n+2
BARRIER
ACTIVE
ACTIVE
ACTIVE
LEO
OUTPUT DATA
DATA n–1 Invalid DATA n+1
FIGURE 4. Data Corruption.
INPUT DATA
LEI
INT. CLK
“JITTER”
FIGURE 5. Jitter in Synchronous Mode.
INPUT
DATA
LEI
INT. CLK
2 1 0 S1 S0 7 6 5 4 3 2 1
“JITTER”
FIGURE 6. Jitter in Asynchronous Mode.
tWH
LEI
DATA IN
DATA OUT
tSU
LEO
DATA OUT
OE
tWL
tPD(sync)
tH
tDD
tEN
DATA IN
DATA OUT
tPD(sync)
FIGURE 7. Timing Diagrams.
tDIS
®
5 ISO508
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ISO508P-U.PDF ] | |
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