STM1404A STMICROELECTRONICS [STMicroelectronics], STM1404A Datasheet - Page 2

• Manufacturer Part Number: STM1404A
• Description: Security Supervisor with Battery Switchover
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STM1404
SUMMARY DESCRIPTION
The STM1404 family of security supervisors are a
low power family of intrusion (tamper) detection
chips targeted at manufacturers of POS terminals
and other systems, to enable them to meet phys-
ical and/or environmental intrusion monitoring
requirements as mandated by various standards,
such as Federal Information Processing Stan-
dards (FIPS) Pub 140 entitled “Security Require-
ments for Cryptographic Modules,” published by
the National Institute of Standards and Technolo-
gy, U.S. Department of Commerce), EMVCo, ISO,
ZKA, and VISA PED.
STM1404 will target the highest security level 4
and include both physical and environmental (volt-
age and temperature) monitoring.
The STM1404 include Automatic Battery Switcho-
ver, RST Output (Open Drain), Manual (Push-but-
ton) Reset Input (MR), Power-fail Comparator
(PFI/PFO),
Tamper Detect/Security Alarm, and Battery Low
Voltage Detect features.
The STM1404A also offers a V
option on pin 9. On STM1404B/C this pin is V
(internally switched V
Figure 2. Logic Diagram
Note: 1. V
2/9
V
TP 1 (NH)
CCSW
2. Normal Mode: Low when V
3. SAL, RST, PFO, and BLD are Open Drain.
MR
PFI
V
(2)
REF
CC
and High when V
only for STM1404A; V
Physical
BLD
(NL)
TP 2
(3)
V
STM1404
(NH)
TP 3
V
CC
TPU
REF
or
OUT
or V
(1)
and/or
is internally switched to battery.
(NL)
V
TP 4
TPU
OUT
BAT
BAT
REF
for STM1404B/C.
is internally switched to
V
).
V
CC
SS
(1.237V) as an
Environmental
AI09682a
V
RST
PFO
SAL
OUT
(3)
(3)
(3)
TPU
V
The STM1404 is available in three versions, corre-
sponding to three modes of the V
Voltage Out), when the SAL (Security Alarm) is as-
serted (active-low) upon tamper detection:
STM1404A. V
when SAL is driven low (activated).
STM1404B. V
driven low (activated).
STM1404C. V
is activated (may be used when V
directly to the V
holds the cryptographic codes).
All variants (see
compatible and available in a security-friendly, low
profile, 16-pin QFN package.
Table 2. Signal Names
Note: See
Vccsw
MR
PFI
TP
V
RST
PFO
SAL
BLD
V
V
V
V
V
OUT
OUT
REF
TPU
BAT
CC
SS
1
(2)
(2)
- TP
(2)
(2)
1. Normal Mode: Low when V
2. SAL, RST, PFO, and BLD are Open Drain.
3. V
(3)
(3)
Pin Modes
(1)
V
PIN DESCRIPTIONS
CC
REF
4
and High when V
only for STM1404A; V
OUT
OUT
OUT
CC
Table 1., Device
is driven to Ground when SAL
V
Manual (Push-button) Reset Input
Power-fail Input
Independent Physical Tamper
Detect Pins 1 through 4
Supply Voltage Output
Active-low Reset Output
Power-fail Output
Security Alarm Output
Battery Low Voltage Detect
1.237V Reference Voltage
Tamper Pull-up
(V
Back-up Supply Voltage
Supply Voltage
Ground
is set to High-Z when SAL is
pin of the external SRAM that
stays ON (at V
CC
CC
OUT
Switch Output
or V
of the full datasheet for details.
is internally switched to battery.
BAT
TPU
OUT
)
for STM1404B/C.
is internally switched to
OUT
Options) are pin-
OUT
CC
is connected
pin (Supply
or V
BAT
)