ISO7220A_15 Datasheet, PDF (1/35 Pages) Texas Instruments – Dual Channel Digital Isolators

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ISO7220A, ISO7220B, ISO7220C, ISO7220M
ISO7221A, ISO7221B, ISO7221C, ISO7221M
SLLS755N – JULY 2006 – REVISED SEPTEMBER 2015
ISO722x Dual Channel Digital Isolators
1 Features
•1 1, 5, 25, and 150-Mbps Signaling Rate Options
– Low Channel-to-Channel Output Skew;
1-ns Max
– Low Pulse-Width Distortion (PWD); 1-ns Max
– Low Jitter Content; 1 ns Typ at 150 Mbps
• 50 kV/μs Typical Transient Immunity
• Operates with 2.8-V (C-Grade),
3.3-V, or 5-V Supplies
• 4-kV ESD Protection
• High Electromagnetic Immunity
• –40°C to 125°C Operating Range
• Typical 28-Year Life at Rated Voltage
(see application report High-Voltage Lifetime of
the ISO72x Family of Digital Isolators (SLLA197)
and Figure 22)
• VDE Basic Insulation with 4000-V_PK V_IOTM, 560
V_PK V_IORM per DIN V VDE V 0884-10 (VDE V
0884-10):2006-12 and DIN EN 61010-1 (VDE
0411-1)
• 2500 V_RMS Isolation per UL 1577
• CSA Approved for Component Acceptance Notice
5A and IEC 60950-1
2 Applications
• Industrial Fieldbus
– Modbus
– Profibus™
– DeviceNet™ Data Buses
• Computer Peripheral Interface
• Servo Control Interface
• Data Acquisition
A binary input signal is conditioned, translated to a
balanced signal, then differentiated by the capacitive
isolation barrier. Across the isolation barrier, a
differential comparator receives the logic transition
information, then sets or resets a flip-flop and the
output circuit accordingly. A periodic update pulse is
sent across the barrier to ensure the proper dc level
of the output. If this dc-refresh pulse is not received
every 4 μs, the input is assumed to be unpowered or
not being actively driven, and the failsafe circuit
drives the output to a logic high state.
The small capacitance and resulting time constant
provide fast operation with signaling rates available
from 0 Mbps (DC) to 150 Mbps (The signaling rate of
a line is the number of voltage transitions that are
made per second expressed in the units bps). The A-
option, B-option, and C-option devices have TTL
input thresholds and a noise filter at the input that
prevents transient pulses from being passed to the
output of the device. The M-option devices have
CMOS V_CC/2 input thresholds and do not have the
input noise filter and the additional propagation delay.
The ISO7220x and ISO7221x devices require two
supply voltages of 2.8 V (C-Grade), 3.3 V, 5 V, or any
combination. All inputs are 5-V tolerant when supplied
from a 2.8-V or 3.3-V supply and all outputs are 4-mA
CMOS.
The ISO7220x and ISO7221x devices are
characterized for operation over the ambient
temperature range of –40°C to 125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO7220x
ISO7221x
SOIC (8)
4.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
3 Description
The ISO7220x and ISO7221x devices are dual-
channel digital isolators. To facilitate PCB layout, the
channels are oriented in the same direction in the
ISO7220x and in opposite directions in the ISO7221x.
These devices have a logic input and output buffer
separated by TI’s silicon-dioxide (SiO₂) isolation
barrier, providing galvanic isolation of up to 4000 V_PK
per VDE. Used in conjunction with isolated power
supplies, these devices block high voltage and isolate
grounds, as well as prevent noise currents on a data
bus or other circuits from entering the local ground
and interfering with or damaging sensitive circuitry.
Simplified Schematic
V_CCI
V_CCO
Isolation
Capacitor
INx
OUTx
GNDI
GNDO
V_CCI and GNDI are supply and ground
connections respectively for the input
channels.
V_CCO and GNDO are supply and ground
connections respectively for the output
channels.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.