TS87C251G2D_14 Datasheet, PDF (1/3 Pages) ATMEL Corporation – Power-down Mode Current Out of Specification in ROMless Mode

Active Errata List
• Power-down Mode Current Out of Specification in ROMless Mode
• Power-fail Threshold Out of Specification
• TWI Data Transmission in Slave Transmitter Mode
Errata History
Lot Number
All lot numbers affected
All TSC8725G2D EPROM devices are affected
Errata List
1, 3
2
Errata Description
1. Power-down Mode Current Out of Specification in ROMless Mode
I_PD is out of specification when EA pin is tied to a low level. The ROMless products
and EPROM and ROM products used as ROMless (EA = 0) are consuming extra
current in power-down mode. Table 1 below shows the power-down current maxi-
mum value and specification for high speed in low voltage versions.
Table 1. DC Characteristics – T_A = -40 to +85°C
Symbol Parameter
Max Spec Max Value
I_PD
Power-down 20
35
Current
I_PD
Power-down 10
20
Current
Units
µA
µA
Test Conditions
V_RET < V_DD < 5.5V
V_RET < V_DD < 3.6V
Workaround
None.
8051
Microcontrollers
TS80C251G2D
TS83C251G2D
TS87C251G2D
Errata Sheet
2. Power-fail Threshold Out of Specification
The tolerance on the power-fail reset voltage threshold is out of specification. The
device may never exit reset at power-up when power-fail reset is enabled.
Workaround
Some devices may need a higher voltage to exit reset. The RSTD bit has to be set
in POWM register to disable the Power-fail Reset detector before the voltage is
reduced.
3. Two-wire Interface Data Transmission in Slave Transmitter Mode
When in slave transmitter mode, if the slave transmits data starting with a low
level on the bus (MSB is logic 0), data set-up time is not respected and leads to a
bus error.
Workaround
The workaround proposed consists in removing the set-up violation by stretching
the SDA line (P1.7) when the MSB of the data to transmit is logic 0. This
workaround must be implemented in states A8h, B0h, and B8h when data is writ-
ten to the serial data register (SSDAT).
Rev. 4179B–8051–10/02