am79c940 Advanced Micro Devices, am79c940 Datasheet - Page 91

• Manufacturer Part Number: am79c940
• Description: Media Access Controller For Ethernet Mace
• Manufacturer: Advanced Micro Devices

DC CHARACTERISTICS over COMMERCIAL operating ranges unless otherwise
specified (continued)
Parameter
Notes:
1. V OH does not apply to open-drain output pins.
2. I IL1 and I IL2 applies to all input only pins except DI ± , CI ± , and XTAL1.
3. Specified for input only pins with internal pull-ups: TC , TDI, TCK, TMS.
4. I OZ applies to all three-state output pins and bi-directional pins.
5. Test not implemented to data sheet specification.
6. Tested, but to values in excess of limits. Test accuracy not sufficient to allow screening guard bands.
7. During the activation of SLEEP :
8. Parameter not tested.
Symbol
VRXDTH
VTXOFF
VTXH
VTXL
VTXI
RTX
I IL1 = ADD4–0, BE 1–0, CS , EAM/R , FDS , RESET , RXDAT, R/ W , SCLK.
I IL2 = TC , TDI, TCK, TMS.
– The following pins are placed in a high impedance state: SRD, SF/BD, TXDAT, DXCVR, DTV , TDTREQ , RDTREQ , NTR
– The following I/O pins are placed in a high impedance mode and have their internal TTL level translators disabled:
– The following input pin has its internal pull-up and TTL level translator disabled: TC .
– The following input pins have their internal TTL level translators disabled and do not have internal pull-ups: CS , FDS ,
– The following pins are pulled low: XTAL1 (XTAL2 feedback is cut off from XTAL1), TXD+, TXD–, TXP+, TXP–, DO+
– The following pins have their input voltage bias disabled: DI+, DI, CI+ and CI.
– AWAKE and RWAKE are reset to zero. I DDSLEEP, with either AWAKE set or RWAKE set, will be much higher and its value
and TDO.
DBUS15–0, EOF , SRDCLK, RXCRS, RXDAT, CLSN, TXEN , STDCLK and TXDAT+.
R/ W , ADD4–0, SCLK, BE 0, BE 1 and EAM/R .
and DO.
remains to be determined.
RXD Switching Threshold
TXD and TXP Output
HIGH Voltage
TXD and TXP Output
LOW Voltage
TXD and TXP
Differential Output
Voltage Imbalance
TXD and TXP Idle
Output Voltage
TXD
Output Impedance
TXP Differential Driver
Output Impedance
Parameter Description
Differential Driver
(Note 4)
DVSS = 0 V
DVDD = +5 V
DVDD = +5 V
(Note 8)
(Note 8)
Test Conditions
Am79C940
DVDD – 0.6
DVSS
Min
–35
–40
DVSS + 0.6
DVDD
Max
+40
35
40
40
80
AMD
Unit
mV
mV
mV
V
V
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