Datasheet

Electrical characteristics ST8024L
14/35 Doc ID 17709 Rev 5
Table 12. Data lines to microcontroller (pins I/OUC, AUX1UC, and AUX2UC with integrated
11 kΩ pull-up resistor to V
DD
)
Symbol Parameter
(1)
Test conditions Min. Typ. Max. Unit
V
OH
High level output voltage
5 V, 3 V and 1.8 V cards;
I
OH
< –40 µA
0.75 V
DD
V
DD
+0.1
V
No DC load 0.9 V
DD
V
DD
+0.1
V
OL
Low level output voltage I
OL
= 1 mA 0 0.3 V
V
IH
High level input voltage 0.7 V
DD
V
DD
+0.3 V
V
IL
Low level input voltage -0.3 0.3 V
DD
V
|I
LIH
|
High level input leakage
current
V
IH
= V
DD
10 µA
|I
L
| Low level input current V
IL
= 0 V 600 µA
R
PU
Internal pull-up resistance to
V
DD
Pull-up resistor to V
DD
91113kΩ
t
T(DI)
Data input transition time V
IL
max. to V
IH
min. 1.2 µs
t
T(DO)
Data output transition time
V
O
= 0 to V
DD
; C
L
< 30 pF;
10% to 90%
0.1 µs
I
PU
Current when pull-up active V
OH
= 0.9 V
DD
; C
L
= 30 pF -1 mA
1. V
DD
= 3.3 V, V
DDP
= 5 V, f
XTAL
= 10 MHz, unless otherwise noted. Typical values are at T
A
= 25 °C.
Table 13. Internal oscillator
Symbol Parameter
(1)
Test conditions Min. Typ. Max. Unit
f
OSC(INT)
Frequency of internal
oscillator
Inactive mode 55 140 200 kHz
Active mode 2.2 2.7 3.2 MHz
1. V
DD
= 3.3 V, V
DDP
= 5 V, f
XTAL
= 10 MHz, unless otherwise noted.Typical values are at T
A
= 25 °C.
Table 14. Reset output to card reader (pin RST)
Symbol Parameter
(1)
Test conditions Min. Typ. Max. Unit
V
O(inactive)
Output voltage in inactive
mode
I
O(inactive)
= 1 mA 0 - 0.3
V
No load 0 - 0.1
I
O(inactive)
Output current Inactive mode; pin grounded 0 - -1 mA
t
D(RSTIN-
RST)
RSTIN to RST delay RST enable - 2 µs
V
OL
Low level output voltage
I
OL
= 200 µA 0 - 0.2
V
I
OL
= 20 mA (current limit) V
CC
-0.4 - V
CC
V
OH
High level output voltage
I
OH
= –200 µA 0.9 V
CC
-V
CC
V
I
OH
= –20 mA (current limit) 0 - 0.4
t
R,
t
F
Rise and fall time C
L
= 100 pF - 0.1 µs
1. V
DD
= 3.3 V, V
DDP
= 5 V, f
XTAL
= 10 MHz, unless otherwise noted. Typical values are at T
A
= 25 °C.