TLK1201ARCP Datasheet, PDF (9/21 Pages) Texas Instruments – ETHERNET TRANSCEIVERS

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TLK1201ARCP, TLK1201AIRCP
ETHERNET TRANSCEIVERS
SLLS580A – FEBRUARY 2004 – REVISED JUNE 2004
Testability
The loopback function provides for at-speed testing of the transmit/receive portions of the circuitry. The enable
function allows for all circuitry to be disabled so that an Iddq test can be performed. The PRBS function also
allows for a BIST (built-in self test). The terminal setting, TESTEN high, enables the test mode. The terminal
TESTEN has an internal pulldown resistor, so it defaults to normal operation. The TESTEN is only used for
factory testing, and is not intended for end-user control.
Loopback Testing
The transceiver can provide a self-test function by enabling (setting LOOPEN to high level) the internal loopback
path. Enabling this function causes serial transmitted data to be routed internally to the receiver. The parallel
data output can be compared to the parallel input data for functional verification. The external differential output
is held in a high-impedance state during the loopback testing.
Enable Function
When held low, ENABLE disables all quiescent power in both the analog and digital circuitry. This allows an
ultralow-power idle state when the link is not active.
PRBS Function
This device has a built-in 2⁷–1 PRBS function. When the PRBSEN control bit is set high, the PRBS test is
enabled. A PRBS is generated and fed into the 10-bit parallel transmitter input bus. Data from the normal parallel
input source is ignored during PRBS test mode. The PRBS pattern is then fed through the transmit circuitry as if
it were normal data and sent out to the transmitter. The output can be sent to a bit error rate tester (BERT) or to
the receiver of another TLK1201AI. Since the PRBS is not really random and is really a predetermined sequence
of 1s and 0s, the data can be captured and checked for errors by a BERT. This device also has a built-in BERT
function on the receiver side that is enabled by PRBSEN. It can receive a PRBS pattern and check for errors,
and then reports the errors by forcing the SYNC/PASS terminal low. The PRBS testing supports two modes
(normal and latched), which are controlled by the SYNCEN input. When SYNCEN is low, the result of the PRBS
bit error rate test is passed to the SYNC/PASS terminal. When SYNCEN is high the result of the PRBS
verification is latched on the SYNC/PASS output (that is, a single failure forces SYNC/PASS to remain low).
ABSOLUTE MAXIMUM RATINGS⁽¹⁾
over operating free-air temperature range (unless otherwise noted)
Supply voltage, V_DD (see ⁽²⁾)
Input voltage range at TTL terminals, V_I
Input voltage range at any other terminal
Storage temperature, T_stg
Electrostatic discharge
Characterized free-air operating temperature range
TLK1201A
TLK1201AI
TLK1201A/TLK1201AI
–0.3 V to 3 V
–0.5 V to 4 V
–0.3 V to V_DD +0.3 V
–65°C to 150°C
CDM: 1 kV, HBM:2 kV
0°C to 70°C
–40°C to 85°C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating
conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values, except differential I/O bus voltages, are with respect to network ground terminal.
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