I.MX27 Datasheet, PDF (43/148 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor

Electrical Characteristics
4.1.3 Test Conditions and Recommended Settings
Unless specified, AC timing parameters are specified for 15 pF loading on i.MX27/iMX27L pads. Drive
strength has been kept at default/reset values for testing. EMI timing has been verified with high drive
strength setting and 25 pF loads. SDHC timing has also been verified with high drive strength setting.
Unless otherwise noted, AC/DC parameters are guaranteed at operating conditions shown in Table 7.
4.2 Module-Level Electrical Specifications
This section contains the i.MX27/iMX27L electrical information including timing specifications, arranged
in alphabetical order by module name.
4.2.1 Pads IO (PADIO) Electricals
4.2.1.1 DC Electrical Characteristics
The over-operating characteristics appear in Table 12 for GPIO pads and Table 13 for DDR (Double Data
Rate) pads (unless otherwise noted).
Table 12. GPIO Pads DC Electrical Parameters
Parameter
High-level output voltage
Symbol
V_OH
Low-level output voltage
V_OL
High-level output current, slow slew rate I_{OH_S}
High-level output current, fast slew rate I_{OH_F}
Low-level output current, slow slew rate I_{OL_S}
Low-level output current, fast slew rate
I_{OL_F}
Input Hysteresis
Schmitt trigger VT+
Schmitt trigger VT-
V_HYS
V_T +
V_T -
Test Conditions
Min
Typical
Max
I_OH = -1 mA
N_VDD -0.15
—
I_OH = specified Drive 0.8*N_VDD
—
I_OL = 1 mA
—
—
I_OL = specified Drive
—
—
V_OH = 0.8*N_VDD
—
Normal
–2
High
–4
Max High¹
–8
V_OH = 0.8*N_VDD
—
Normal
–4
High
–6
Max High¹
–8
V_OL = 0.2*N_VDD
Normal
High
Max High¹
—
2
4
8
V_OL = 0.2*N_VDD
Normal
High
Max High¹
—
4
6
8
Hysteresis enabled
0.25
—
Hysteresis enabled 0.5*Q_VDD
—
Hysteresis enabled
—
—
—
—
0.15
0.2*N_VDD
—
—
—
—
—
—
0.5*Q_VDD
Units
V
V
V
V
mA
mA
mA
mA
V
V
V
i.MX27 and i.MX27L Data Sheet, Rev. 1.5
Freescale Semiconductor
43