ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 127

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
16.9.2
RESET pin protection when LVD is disabled
When the LVD is disabled, it is recommended to protect the RESET pin as shown in
Figure 65
1.
2.
3.
4.
Figure 65. RESET pin protection when LVD is disabled
USB - universal bus interface
Operating conditions T
Table 73.
1.
2.
3.
Required
Symbol
EXTERNAL
USBV
CIRCUIT
All the voltages are measured from the local ground potential.
RL is the load connected on the USB drivers.
To improve EMC performance (noise immunity), it is recommended to connect a 100nF capacitor to the USBVCC pin.
V
V
RESET
V
V
V
The reset network protects the device against parasitic resets.
The output of the external reset circuit must have an open-drain output to drive the ST7
reset pad. Otherwise the device can be damaged when the ST7 generates an internal
reset (LVD or watchdog).
Whatever the reset source is (internal or external), the user must ensure that the level
on the RESET pin can go below the V
Otherwise the reset will not be taken into account internally.
Because the reset circuit is designed to allow the internal RESET to be output in the
RESET pin, the user must ensure that the current sunk on the RESET pin (by an
external pull-up for example) is less than the absolute maximum value specified for
I
CM
OH
OL
SE
DI
INJ(RESET)
and follow these guidelines:
Differential Input Sensitivity
Differential Common Mode
Range
Single Ended Receiver
Threshold
Static Output Low
Static Output High
USBVCC: voltage level
USB DC electrical characteristics
0.01 μF
in
Section 16.2 on page
Parameter
A
= 0 to +70 °C, V
(3)
V
DD
I(D+, D-)
Includes VDI range
RL
to 3.6v
RL
to V
V
111.
DD
DD
R
(2)
ON
Conditions
(2)
IL
SS
=5 V
Filter
= 4.0 to 5.25 V unless otherwise specified.
of 1.5 Kohms
max. level specified in
of 15 Kohms
(1)
GENERATOR
PULSE
Min.
3.00
0.2
0.8
0.8
2.8
Electrical characteristics
Section
INTERNAL
RESET
WATCHDOG
Max.
3.60
16.9.1.
ST72XXX
2.5
2.0
3.6
0.3
127/139
Unit
V