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SPEAR1340 Datasheet(PDF) 138 Page - STMicroelectronics

Part # SPEAR1340
Description  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPEAR1340 Datasheet(HTML) 138 Page - STMicroelectronics

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Electrical characteristics
SPEAr1340
138/200
Doc ID 023063 Rev 4
4.4
I/O AC/DC characteristics
The following sections show the electrical AC/DC characteristics of the I/Os present in
SPEAr1340.
4.4.1
3V3/2V5/1V8 I/O buffers (IOTYPE1/IOTYPE2/IOTYPE3)
The 3V3/2V5/1V8 buffers are designed to operate at 3.3 V, 2.5 V, and 1.8 V supply level.
Even if they support switchable supplies, each I/O type has limited supply flexibility by
design:
IOTYPE1: only 3V3
IOTYPE2: 3V3/1V8
IOTYPE3: 3V3/2V5
Features
●
Switchable 1.8 V, 2.5 V, or 3.3 V supply
●
Input with hysteresis
●
Programmable drive and slew
●
Programmable pull-up/down functionality
DC characteristics
Table 46 shows the DC characteristics for 3V3/2V5/1V8 I/O buffers.
Table 46.
3V3/2V5/1V8 I/O DC characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDDx
1V8 supply voltage
–
1.65
–
1.95
V
2V5 supply voltage
–
2.25
–
2.75
V
3V3 supply voltage
–
3.0
–
3.6
V
Receiver characteristics(1)
1V8 I/O operation
VIH
High level input voltage
–
0.65*VDD
x
–
VDDx+0.3
V
VIL
Low level input voltage
–
-0.3
–
0.35*VDD
x
V
Vhyst
Schmitt trigger hysteresis
–
50
–
-
mV
2V5 I/O operation
VIH
High level input voltage
–
1.7
–
VDDx+0.3
V
VIL
Low level input voltage
–
-0.3
–
0.7
V
Vhyst
Schmitt trigger hysteresis
–
50
–
mV
3V3 I/O operation
VIH
High level input voltage
–
2.0
–
VDDx+0.3
V



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