TV04A180JB-G Comchip Technology, TV04A180JB-G Datasheet - Page 15

• Manufacturer Part Number: TV04A180JB-G
• Description: TVS 400W 18V BIDIRECT SMA
• Manufacturer: Comchip Technology

Specifications of TV04A180JB-G

• Voltage - Reverse Standoff (typ): 18V
• Voltage - Breakdown: 20V
• Power (watts): 400W
• Polarization: Bidirectional
• Mounting Type: Surface Mount
• Package / Case: DO-214AC, SMA
• Channels: 1 Channel
• Clamping Voltage: 29.2 V
• Operating Voltage: 3.5 V
• Breakdown Voltage: 20 V
• Peak Surge Current: 40 A
• Peak Pulse Power Dissipation: 400 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the 16 Kbyte boot sector from
erasure without using V
If the system asserts V
disables erase functions for the 16 Kbyte boot sector
(SA34 for top boot device and SA0 for bottom boot de-
vice) independently of whether those sectors were
protected or unprotected using the method described
in
If the system asserts V
reverts to whether the 16 Kbyte boot sector was previ-
ously set to be protected or unprotected using the
method described in
on page
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to V
sectors can be programmed or erased by selecting the
sector addresses. However, note that the boot sector is
still protected from erasure only if WP# is asserted low.
Once V
viously protected sectors are protected again.
on page 14
page 38
April 23, 2010 Am29F160D_00_D10
Sector Protection/Unprotection‚ on page
ID
12.
shows the timing diagrams, for this feature.
is removed from the RESET# pin, all the pre-
shows the algorithm, and
ID
. During this mode, formerly protected
Sector Protection/Unprotection‚
ID
IH
IL
.
on the WP# pin, the device
on the WP# pin, the device
Figure 19, on
12.
Figure 2,
D A T A S H E E T
Am29F160D
Notes:
1. All protected sectors unprotected. However, boot sector
2. All previously protected sectors are protected once
Figure 1. Temporary Sector Unprotect Operation
remains protected from erasure only if WP# is low.
again.
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
ID
IH
13