STR91XFA STMICROELECTRONICS [STMicroelectronics], STR91XFA Datasheet - Page 59

• Manufacturer Part Number: STR91XFA
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STR91xFA
6.12.7 Electrical Sensitivities
Notes:
1. Class description: A Class is an STMicroelectronics internal specification. All its limits are higher than the JEDEC
6.13
Notes: 1 The internal EMI Bus clock signal is available externally only on LFBGA144 packages (ball M8),
specifications, that means when a device belongs to Class A it exceeds the JEDEC standard. B Class strictly covers all the
JEDEC criteria (international standard).
2 EMI_ratio =1/ 2 by default (can be programmed to be 1 by setting the proper bits in the
●
Prequalification trials:
Most of the common failures (unexpected reset and program counter corruption) can be
reproduced by manually forcing a low state on the RESET pin or the Oscillator pins for 1
second.
To complete these trials, ESD stress can be applied directly on the device, over the range of
specification values. When unexpected behavior is detected, the software can be hardened to
prevent unrecoverable errors occurring (see application note AN1015).
External memory bus timings
V
Table 24.
and not available on LQFP packages.
SCU_CLKCNTR register)
Table 25.
t
t
t
t
t
t
t
t
Symbol
BCLK
RCR
RP
RDS
RDH
RAS
RAH
AW
DDQ
Symbol
DLU
LU
Critical Data corruption (control registers...)
= 2.7 - 3.6V, V
Read to CSn inactive
Read Pulse Width
Read Data Setup Time
Read Data Hold Time
Read Address Setup Time
Read Address Hold Time
ALE pulse width
EMI Bus Clock Period
Symbol
EMI read operation
Static latch-up class
Dynamic latch-up class
Parameter
Parameter
DD
= 1.65 - 2V, T
EMI Bus Clock period
T
V
f
(ALE_LENGTH) x t
OSC
A
A
(WSTRD-WSTOEN+1) x
DDQ
=+25°C
(WSTOEN) x t
= -40 / 85 °C, C
/f
=3.3V, V
CPUCLK
Parameter
t
BCLK
Min
-1
0
4
0
=4 MHz/96 MHz
DD
- 1
=1.8V,
BCLK
Conditions
BCLK
L
= 30 pF unless otherwise specified.
- 1
- 1
Value
(ALE_LENGTH) x t
(WSTRD-WSTOEN+1) x
(WSTOEN) x t
1 /(f
t
BCLK
Electrical characteristics
HCLK
Max
+1
+ 1
Value
x EMI_ratio)
BCLK
BCLK
+ 1
Class
+ 1
A
A
1)
59/78
Unit
ns
ns
ns
ns
ns
ns
ns