LAN88710_samples SMSC, LAN88710_samples Datasheet - Page 72

• Manufacturer Part Number: LAN88710_samples
• Description: Ethernet ICs MII/RMII 10/100 Automot Transceiver
• Manufacturer: SMSC

Specifications of LAN88710_samples

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.6 V
• Maximum Operating Temperature: + 85 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.1 (05-26-10)
5.6.3
Configuration Strap
Configuration Strap
Pins Output Drive
SYMBOL
t
t
Power Supplies
t
purstd
purstv
t
t
t
t
odad
rstia
otaa
csh
css
All External
Pins Input
Power-On nRST & Configuration Strap Timing
This diagram illustrates the nRST reset and configuration strap timing requirements in relation to
power-on. A hardware reset (nRST assertion) is required following power-up. For proper operation,
nRST must be asserted for no less than t
not be deasserted before t
operating levels. In order for valid configuration strap values to be read at power-up, the t
timing constraints must be followed. Refer to
information.
Note: nRST deassertion must be monotonic.
Note: Device configuration straps are latched as a result of nRST assertion. Refer to
Note 5.14 20 clock cycles for 25 MHz, or 40 clock cycles for 50 MHz
External power supplies at 80% to nRST deassertion
External power supplies at 80% to nRST valid
nRST input assertion time
Configuration strap pins setup to nRST deassertion
Configuration strap pins hold after nRST deassertion
Output tri-state after nRST assertion
Output drive after deassertion
nRST
"Configuration Straps," on page 37
low and must not be driven as inputs.
Table 5.8 Power-On nRST & Configuration Strap Timing Values
Figure 5.3 Power-On nRST & Configuration Strap Timing
80%
DESCRIPTION
purstd
t
purstv
Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
after all external power supplies have reached 80% of their nominal
DATASHEET
rstia
72
for details. Configuration straps must only be pulled high or
t
purstd
. The nRST pin can be asserted at any time, but must
Section 3.8.5, "Resets," on page 43
t
otaa
t
rstia
MIN
100
200
25
0
1
2
t
css
SMSC LAN88710AM/LAN88710BM
TYP
t
t
odad
csh
(Note
MAX
800
50
5.14)
for additional
Section 3.7,
css
Datasheet
UNITS
and t
ms
ns
μs
ns
ns
ns
ns
csh