TC58NVG2S0HBAI4
2013-07-05C
27
PIN FUNCTIONS
The device is a serial access memory which utilizes time-sharing input of address information.
Command Latch Enable: CLE
The CLE input signal is used to control loading of the operation mode command into the internal command
register. The command is latched into the command register from the I/O port on the rising edge of the
WE
signal while CLE is High.
Address Latch Enable: ALE
The ALE signal is used to control loading address information into the internal address register. Address
information is latched into the address register from the I/O port on the rising edge of
WE
while ALE is High.
Chip Enable:
The device goes into a low-power Standby mode when
CE
goes High during the device is in Ready state. The
CE
signal is ignored when device is in Busy state (
BY/RY
= L), such as during a Program or Erase or Read
operation, and will not enter Standby mode even if the
CE
input goes High.
Write Enable:
The
WE
signal is used to control the acquisition of data from the I/O port.
Read Enable:
The
RE
signal controls serial data output. Data is available t
REA
after the falling edge of
RE
.
The internal column address counter is also incremented (Address = Address + l) on this falling edge.
I/O Port: I/O1 to 8
The I/O1 to 8 pins are used as a port for transferring address, command and input/output data to and from
the device.
Write Protect:
The
WP
signal is used to protect the device from accidental programming or erasing. The internal voltage
regulator is reset when
WP
is Low. This signal is usually used for protecting the data during the power-on/off
sequence when input signals are invalid.
Ready/Busy:
The
BY/RY
output signal is used to indicate the operating condition of the device. The
BY/RY
signal is
in Busy state (
BY/RY
= L) during the Program, Erase and Read operations and will return to Ready state
(
BY/RY
= H) after completion of the operation. The output buffer for this signal is an open drain and has to be
pulled-up to Vccq with an appropriate resister.
If
BY/RY
signal is not pulled-up to Vccq( “Open” state ), device operation can not guarantee.
CE
WE
RE
WP
BY/RY
