AT16646
Features
∙Fastest Propagation Speeds in the Industry TPD (F grade) = 2.5 ns, TPD (G grade) = 2.0 ns
∙Maximum derating for capacitive loads 1.5ns/100 pF (F grade) and 1.1ns/100 pF (G grade)
∙Very low ground bounce < 0.6 V @ VCC=5.00 V, Ta=25°C
∙Typical output skew ≤0.25ns
∙Bus Hold circuitry to retain last active state during Tri-State™
∙Available in SSOP and TSSOP packages
Description
Atmel’s AT16646 devices are 16-bit high speed, low power Tri-statable D type registers, ideal for use in systems requiring both transparent and registered mode functions. They are organized as two separate 8-bit bus transceivers. Data flow is bi-directional, and can be controlled for multiplexed transmission between A bus and B bus either directly or from the D registers by use of the direction control pin (xDir), output enable (xOE), and select lines (xSAB and xSBA). Storage of data on the A bus and B bus is controlled by the output pins. They have very low ground bounce and excellent input noise rejection, giving the user stable signals in a high speed environment. The Bus Hold feature eliminates the need for pull-up or pull-down resistors and retains the last active state during a Tri-State event.
Functional Block Diagram
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Pin Configurations |
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SSOP/TSSOP |
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1DIR |
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|||||
Pin Names |
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Descriptions |
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1CLKAB |
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1 |
2 |
56 |
55 |
1CLKBA 1OE |
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1SAB |
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GND |
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3 |
4 |
54 |
53 |
GND |
1SBA |
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1A1 |
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1A2 |
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5 |
6 |
52 |
51 |
1B2 |
1B1 |
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VCC |
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7 |
50 |
VCC |
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xDir, xOE |
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Output Enable Inputs |
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1A3 |
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8 |
49 |
1B3 |
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1A4 |
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9 |
48 |
1B4 |
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1A5 |
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10 |
47 |
1B5 |
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xCLKAB,xCLKBA |
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Clock Pulse Inputs |
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GND |
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1A6 |
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11 |
12 |
46 |
45 |
1B6 |
GND |
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1A7 |
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1A8 |
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13 |
14 |
44 |
43 |
1B8 |
1B7 |
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2A1 |
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xSAB, xSBA |
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Output Data Source Select Inputs |
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2A2 |
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15 |
16 |
42 |
41 |
2B2 |
2B1 |
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2A3 |
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GND |
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17 |
18 |
40 |
39 |
GND |
2B3 |
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xAχ |
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Data Register A Inputs |
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2A4 |
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19 |
38 |
2B4 |
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2A5 |
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20 |
37 |
2B5 |
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Data Register B Outputs |
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2A6 |
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VCC |
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21 |
22 |
36 |
35 |
VCC |
2B6 |
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2A7 |
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2A8 |
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23 |
24 |
34 |
33 |
2B8 |
2B7 |
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GND |
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25 |
32 |
GND |
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xBχ |
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Data Register B Inputs |
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2SAB |
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26 |
31 |
2SBA |
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2CLKAB |
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2DIR |
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27 |
28 |
30 |
29 |
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2CLKBA |
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2OE |
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Data Register A Outputs |
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Top View
AT16646 Fast Logic™
16-Bit Tri-State™
Register
AT16646F
AT16646G
0757B
5-21
Function Table(1)
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Inputs |
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Data I/O(2) |
Operation or Function |
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xOE |
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xDir |
xCLKAB |
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xCLKBA |
xSAB |
xSBA |
xAχ |
xBχ |
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H |
X |
H or L |
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H or L |
X |
X |
Input |
Input |
Isolation |
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H |
X |
− |
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− |
X |
X |
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Store A and B Data |
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L |
L |
X |
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X |
X |
L |
Output |
Input |
Real Time B Data to A Bus |
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L |
L |
X |
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H or L |
X |
H |
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Stored B Data to A Bus |
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L |
H |
X |
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X |
L |
X |
Input |
Output |
Real Time A Data to B Bus |
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L |
H |
H or L |
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X |
H |
X |
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Stored A Data to B Bus |
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Notes: |
1. H = High voltage level, L = Low voltage level, X = Don’t care, − = Low-to-High transition |
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2.The data output functions may be enabled or disabled by various signals at the xOE or xDir inputs. Data input functions are always enabled, i.e. data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
Absolute Maximum Ratings*
Operating Temperature........................ |
0°C to +70°C |
Storage Temperature ...................... |
-65°C to +150°C |
Voltage on any Pin |
-2.0 V to +7.0 V(1) |
with Respect to Ground................. |
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Maximum Operating Voltage.............................. |
6.0V |
5.0 Volt DC Characteristics
*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Notes: 1. Minimum voltage is -0.6 V dc which may undershoot to -2.0 V for pulses of less than 20 ns. Maximum output pin voltage is VCC +0.75 V dc which may overshoot to +7.0 V for pulses of less than 20 ns.
Applicable over recommended operating range from Ta = 0°C to +70°C, V CC = +5.0V +/- 5% (unless otherwise noted)
Symbol |
Parameter |
Test Conditions |
Min |
Typ |
Max |
Units |
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ICC |
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Quiescent Power Supply |
VCC = Max, VIN = 3.4 V |
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0.8 |
1.2 |
mA |
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Current |
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VIH |
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Input High Voltage |
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2.0 |
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V |
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VIL |
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Input Low Voltage |
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0.8 |
V |
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IIH |
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Input High Current (I/O Pins) |
VIN = VCC |
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±15 |
μA |
IIL |
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Input Low Current (I/O Pins) |
VIN = GND |
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±15 |
μA |
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IOZ |
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Output Leakage Current |
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±10 |
μA |
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VOH(1) |
Output High Voltage |
VCC = 4.75 V |
2.7 |
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V |
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F Grade only |
IOH = -10 mA |
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VOH(2) |
Output High Voltage |
VCC = 4.75 V |
2.7 |
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V |
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G Grade only |
IOH = -12 mA |
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VOL |
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Output Low Voltage (F Grade) |
IOL = 10 mA |
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0.55 |
V |
VOL |
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Output Low Voltage (G Grade) |
IOL = 12 mA |
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0.55 |
V |
Note: 1. |
F grade: At VCC (max), the value of VOH(max) = 3.75 V and at VCC(min), VOH(max) = 3.25 V |
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2. |
G grade: At VCC (max), the value of VOH(max) = 3.75 V and at VCC(min), VOH(max) = 3.35 V |
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5-22 |
AT16646 |
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